Quarter	Number of Buildings, Seasonally Adjusted
1972-01-01	22298.21398871980
1972-04-01	18911.24322084730
1972-07-01	20877.08853705150
1972-10-01	24982.17232189080
1973-01-01	22642.24649851330
1973-04-01	27178.48255603990
1973-07-01	25309.34432258920
1973-10-01	23874.38676133190
1974-01-01	24067.15251244830
1974-04-01	22887.30340316120
1974-07-01	23021.56249748310
1974-10-01	21904.78956095040
1975-01-01	21895.24749868030
1975-04-01	22447.03941725550
1975-07-01	21941.91631565360
1975-10-01	20255.59144302860
1976-01-01	18769.35081341180
1976-04-01	18862.50994688820
1976-07-01	17781.27290904200
1976-10-01	23811.66099455540
1977-01-01	19379.56060570340
1977-04-01	17619.65377735640
1977-07-01	19102.11170327090
1977-10-01	18160.51050946210
1978-01-01	21389.10431200750
1978-04-01	17164.74281818910
1978-07-01	16988.96321855730
1978-10-01	20557.27827525450
1979-01-01	14159.00364185800
1979-04-01	14129.71928680980
1979-07-01	14897.76621536020
1979-10-01	14092.35407380370
1980-01-01	14893.70064984670
1980-04-01	17084.24468946860
1980-07-01	14526.82149049400
1980-10-01	15084.37734987140
1981-01-01	15919.31390813910
1981-04-01	15205.65574512210
1981-07-01	14621.20818564410
1981-10-01	14150.77502674070
1982-01-01	14239.92973560500
1982-04-01	12377.65680209340
1982-07-01	12700.28236309920
1982-10-01	15537.46333706550
1983-01-01	14509.26178720060
1983-04-01	13868.38487375520
1983-07-01	11716.25704576760
1983-10-01	16438.37199233430
1984-01-01	12161.46464120480
1984-04-01	11047.82935105210
1984-07-01	9745.30767271019
1984-10-01	16001.45420125400
1985-01-01	11772.60739608030
1985-04-01	15307.88380386960
1985-07-01	12737.92031860340
1985-10-01	13813.62775484650
1986-01-01	11627.20552448830
1986-04-01	13757.76480527280
1986-07-01	12670.02948776200
1986-10-01	13620.89937149220
1987-01-01	14438.58880447340
1987-04-01	15124.58364555220
1987-07-01	16276.05026586360
1987-10-01	14692.30610693170
1988-01-01	15830.60730042930
1988-04-01	15026.24659133650
1988-07-01	16722.03152265920
1988-10-01	17713.97331159410
1989-01-01	18072.50808565490
1989-04-01	17909.64786971650
1989-07-01	16929.86499792810
1989-10-01	16115.12448511590
1990-01-01	15797.32403719260
1990-04-01	14159.46455022120
1990-07-01	14072.35719629060
1990-10-01	13576.13932746030
1991-01-01	12721.73973232000
1991-04-01	12675.75120978640
1991-07-01	13207.74784624120
1991-10-01	10698.60496878750
1992-01-01	11641.16370471700
1992-04-01	12345.91672023570
1992-07-01	12055.52869427470
1992-10-01	14268.51306763500
1993-01-01	10747.31062159990
1993-04-01	11750.73052019680
1993-07-01	11360.39114595840
1993-10-01	13578.34536284550
1994-01-01	13288.92933766570
1994-04-01	13560.52432261590
1994-07-01	14141.71678319000
1994-10-01	15801.67568214510
1995-01-01	17956.15888032740
1995-04-01	18712.13522817270
1995-07-01	18977.18968344430
1995-10-01	17518.15647583510
1996-01-01	16171.18822284820
1996-04-01	18122.21675947990
1996-07-01	17652.32217257110
1996-10-01	17717.62063952010
1997-01-01	17432.93543209760
1997-04-01	19700.70965371290
1997-07-01	19671.91035441760
1997-10-01	21175.28509829200
1998-01-01	24751.36639313290
1998-04-01	21261.65659527410
1998-07-01	24452.03199067040
1998-10-01	27561.28088912150
1999-01-01	30418.41822599030
1999-04-01	30269.55796520010
1999-07-01	32675.40796562400
1999-10-01	29368.39211564830
2000-01-01	30844.03677006620
2000-04-01	34516.94188713150
2000-07-01	33550.00324439630
2000-10-01	29527.38968978230
2001-01-01	32415.44081907680
2001-04-01	32451.36756816260
2001-07-01	30163.00560594090
2001-10-01	31567.74324729910
2002-01-01	29668.02600954200
2002-04-01	29692.02082359140
2002-07-01	33819.02117633800
2002-10-01	37234.99873399820
2003-01-01	35335.02401883050
2003-04-01	36207.44129296000
2003-07-01	39003.60593261170
2003-10-01	40068.49299648420
2004-01-01	40281.97259200900
2004-04-01	41312.18521227990
2004-07-01	41480.88630974820
2004-10-01	41882.89624723570
2005-01-01	47249.54290469090
2005-04-01	41657.31087706680
2005-07-01	43315.27800379090
2005-10-01	41924.09847237070
2006-01-01	43778.10447830620
2006-04-01	45826.34512229400
2006-07-01	45061.74676736690
2006-10-01	50217.95998057870
2007-01-01	42295.12514993500
2007-04-01	39018.36686259250
2007-07-01	36953.06217962560
2007-10-01	31998.23088510220
2008-01-01	28774.31833927330
2008-04-01	23414.65851695330
2008-07-01	14847.73496371360
2008-10-01	12636.00918485080
2009-01-01	7703.95922438199
2009-04-01	6755.91728030430
2009-07-01	5836.14210383911
2009-10-01	6444.80766560826
2010-01-01	5973.94477373839
2010-04-01	5797.15609988114
2010-07-01	4681.25800056319
2010-10-01	4468.46041134160
2011-01-01	5072.33838971677
2011-04-01	4506.51872603532
2011-07-01	4244.70217253029
2011-10-01	3613.15102035310
2012-01-01	3521.23343873991
2012-04-01	2844.26033151597
2012-07-01	2812.65538832012
2012-10-01	2332.38355158648
2013-01-01	2346.25123174465
2013-04-01	2428.79555755294
2013-07-01	2321.16146285960
2013-10-01	2720.55589688911
2014-01-01	2597.39058767924
2014-04-01	2618.90087386026
2014-07-01	2826.01714774035
2014-10-01	2690.66946921979
2015-01-01	3167.46335980290
2015-04-01	3623.42454791494
2015-07-01	3941.30441403712
2015-10-01	4400.52334423301
2016-01-01	4755.70796779217
2016-04-01	4528.25987192930
2016-07-01	4660.02675826282
2016-10-01	5402.92208021390
2017-01-01	5570.91871663306