Quarter	Number of Buildings, Seasonally Adjusted
1960-01-01	16229.36262656000
1960-04-01	16746.22104593850
1960-07-01	18812.03390396170
1960-10-01	19061.33490994170
1961-01-01	21209.08412465130
1961-04-01	18047.28904898900
1961-07-01	17920.73208394900
1961-10-01	20208.45694083250
1962-01-01	23320.09535830960
1962-04-01	22588.48056986950
1962-07-01	22559.50889224920
1962-10-01	24041.63669699340
1963-01-01	14713.46667532130
1963-04-01	21291.98081737020
1963-07-01	23041.05191519160
1963-10-01	23969.71155069940
1964-01-01	21106.69869413820
1964-04-01	27727.61958117680
1964-07-01	28747.15611413150
1964-10-01	18524.63881254970
1965-01-01	26248.04938277210
1965-04-01	21655.52617754390
1965-07-01	18950.97018260040
1965-10-01	27728.17666316650
1966-01-01	20822.75875971320
1966-04-01	18289.98801660910
1966-07-01	19681.76007467470
1966-10-01	34346.89728310260
1967-01-01	22287.66283085950
1967-04-01	29077.85251304650
1967-07-01	29056.05851860240
1967-10-01	18877.63838773300
1968-01-01	28814.35608757100
1968-04-01	27661.22625330630
1968-07-01	28802.21381042740
1968-10-01	23189.41777980030
1969-01-01	28185.83390336850
1969-04-01	26963.77492448660
1969-07-01	28485.35809228970
1969-10-01	22567.02129329440
1970-01-01	26010.90578943950
1970-04-01	22202.15613139980
1970-07-01	19122.90421175740
1970-10-01	22299.62910354480
1971-01-01	21940.03559178930
1971-04-01	25581.20471730020
1971-07-01	26276.02138213780
1971-10-01	28457.77751650820
1972-01-01	22331.68023418310
1972-04-01	25450.43822235170
1972-07-01	24042.91994380010
1972-10-01	25392.32517158630
1973-01-01	23733.78393335870
1973-04-01	19337.86275550980
1973-07-01	20641.59889988190
1973-10-01	17972.00925487240
1974-01-01	19144.58837740370
1974-04-01	18918.28570516910
1974-07-01	16092.01327733190
1974-10-01	24914.44447421890
1975-01-01	11755.00583124680
1975-04-01	11541.20193153750
1975-07-01	12502.30750864020
1975-10-01	14717.80242130670
1976-01-01	14692.79790781800
1976-04-01	16286.01113904750
1976-07-01	14066.07669486850
1976-10-01	12883.14618887480
1977-01-01	12825.99024904300
1977-04-01	13104.59459305280
1977-07-01	13241.30731863860
1977-10-01	14493.42148071010
1978-01-01	15104.52509810050
1978-04-01	14779.87525836780
1978-07-01	14641.19968884480
1978-10-01	13394.08955667190
1979-01-01	13736.80329342080
1979-04-01	15333.86237503760
1979-07-01	13966.21092300020
1979-10-01	13266.29514203840
1980-01-01	12903.67682189450
1980-04-01	12890.00691779410
1980-07-01	12421.52281805120
1980-10-01	12164.93569904930
1981-01-01	11143.03487008550
1981-04-01	10981.50534785470
1981-07-01	11307.12183962410
1981-10-01	11122.76217473070
1982-01-01	10952.39272712580
1982-04-01	10532.20453900530
1982-07-01	10601.37830733980
1982-10-01	10101.92099276610
1983-01-01	10724.14013608170
1983-04-01	9311.50790029652
1983-07-01	9005.16271354584
1983-10-01	9084.67079635865
1984-01-01	8097.13427694812
1984-04-01	9291.67434558364
1984-07-01	7809.55721598994
1984-10-01	8804.98250568541
1985-01-01	8583.10717544587
1985-04-01	7193.86852642928
1985-07-01	6398.61531026653
1985-10-01	5850.71024090149
1986-01-01	6479.30811306766
1986-04-01	7458.73600464654
1986-07-01	7879.14859245420
1986-10-01	8687.44204370807
1987-01-01	8327.56531133379
1987-04-01	9100.18134061797
1987-07-01	10307.27238560290
1987-10-01	11678.07255807840
1988-01-01	12479.35101658600
1988-04-01	12249.12119511110
1988-07-01	13231.13681718720
1988-10-01	12899.41568283160
1989-01-01	14565.53220522990
1989-04-01	15518.33100413350
1989-07-01	15015.05601341860
1989-10-01	13971.09129119360
1990-01-01	16946.95546287660
1990-04-01	16818.05927774500
1990-07-01	18052.66745066270
1990-10-01	17620.93221834020
1991-01-01	16025.88956034820
1991-04-01	14796.47787802950
1991-07-01	14808.74981230150
1991-10-01	11739.80766379730
1992-01-01	12137.00229207340
1992-04-01	16665.44024937300
1992-07-01	6467.10716223868
1992-10-01	12872.09825070480
1993-01-01	4247.76534739304
1993-04-01	2149.51933901399
1993-07-01	1878.70869604783
1993-10-01	3378.79052186310
1994-01-01	2207.09688858470
1994-04-01	2915.71557608894
1994-07-01	3011.11898016353
1994-10-01	3337.23490348766
1995-01-01	2879.43599441515
1995-04-01	2259.39387395413
1995-07-01	3187.91812664847
1995-10-01	3906.89717344202
1996-01-01	3997.82838609489
1996-04-01	3813.30217080255
1996-07-01	3316.97833417957
1996-10-01	2264.64599477108
1997-01-01	2134.81615274242
1997-04-01	2908.44066454098
1997-07-01	3073.69150679408
1997-10-01	3511.93803451126
1998-01-01	2897.37175775860
1998-04-01	3077.66238367130
1998-07-01	2564.88025796477
1998-10-01	3887.32776846076
1999-01-01	3680.11569578008
1999-04-01	3448.97699336469
1999-07-01	4176.55147856050
1999-10-01	3521.38368828443
2000-01-01	4042.19005946098
2000-04-01	4674.98865790708
2000-07-01	4106.26346691365
2000-10-01	4134.18797139600
2001-01-01	4763.57506027996
2001-04-01	4560.04351289134
2001-07-01	6256.58200695742
2001-10-01	4217.70143185253
2002-01-01	5327.58062418470
2002-04-01	4884.15762201323
2002-07-01	4655.60048938152
2002-10-01	4342.30311426870
2003-01-01	5144.94523873905
2003-04-01	5153.02706469885
2003-07-01	5427.82703987090
2003-10-01	6310.94904881843
2004-01-01	6486.28711846728
2004-04-01	7056.89571352195
2004-07-01	6493.50587453388
2004-10-01	7154.89773058461
2005-01-01	7793.16181718867
2005-04-01	8124.22404848790
2005-07-01	7356.55851020959
2005-10-01	8336.98020374228
2006-01-01	8128.18991077810
2006-04-01	8726.49243186006
2006-07-01	9984.45574255201
2006-10-01	17671.12474426470
2007-01-01	7198.14338316387
2007-04-01	6096.57572981048
2007-07-01	7646.31398164632
2007-10-01	6851.17741903024
2008-01-01	6442.37367427749
2008-04-01	5319.80442287792
2008-07-01	4629.21908162165
2008-10-01	4888.21203147131
2009-01-01	4005.91872877306
2009-04-01	4136.48584937147
2009-07-01	4778.69009807424
2009-10-01	5156.43093613176
2010-01-01	5741.19877088298
2010-04-01	7383.64827925312
2010-07-01	6719.15224056274
2010-10-01	7684.80379531459
2011-01-01	8024.86626014410
2011-04-01	7235.29315973806
2011-07-01	6028.81072866932
2011-10-01	5368.25461732732
2012-01-01	5491.19915614887
2012-04-01	5470.12015122873
2012-07-01	5315.31208819338
2012-10-01	5067.42651080299
2013-01-01	7144.68540831756
2013-04-01	6944.76187230766
2013-07-01	7729.04918953251
2013-10-01	8836.55735964314
2014-01-01	8428.26468110428
2014-04-01	8290.62276645068
2014-07-01	9008.15810415259
2014-10-01	11155.82904212710
2015-01-01	10713.73434666370
2015-04-01	11890.14340534400
2015-07-01	13646.56027510180
2015-10-01	11938.69044436150
2016-01-01	13807.58014466380
2016-04-01	14882.60189617370
2016-07-01	16293.47858958170
2016-10-01	15306.26017088930
2017-01-01	15902.29886608190
2017-04-01	15939.98592870300
2017-07-01	14483.56563957810
2017-10-01	17129.82272725760
2018-01-01	12865.46914700760
2018-04-01	11506.46291871910