Quarter	Number of Buildings, Seasonally Adjusted
1991-01-01	453418.811963949
1991-04-01	448085.919197048
1991-07-01	460898.137209181
1991-10-01	480342.999100777
1992-01-01	515205.547289026
1992-04-01	564079.010185262
1992-07-01	773619.415468645
1992-10-01	609276.680983188
1993-01-01	692870.199210876
1993-04-01	666057.313693070
1993-07-01	662830.038220610
1993-10-01	549080.319470769
1994-01-01	613496.442707574
1994-04-01	658916.612268631
1994-07-01	663615.015837028
1994-10-01	656536.985719916
1995-01-01	702965.677934061
1995-04-01	832195.501708203
1995-07-01	741157.458571080
1995-10-01	679032.222118335
1996-01-01	806199.592931525
1996-04-01	702807.918457725
1996-07-01	876161.115803182
1996-10-01	823903.979936826
1997-01-01	756685.863822127
1997-04-01	1012950.904929910
1997-07-01	739444.381361411
1997-10-01	786795.633642896
1998-01-01	885877.893257968
1998-04-01	799843.872020505
1998-07-01	580620.378786635
1998-10-01	535890.837443791
1999-01-01	492598.228513735
1999-04-01	458763.228194463
1999-07-01	663139.774199581
1999-10-01	657251.605553825
2000-01-01	583847.528289727
2000-04-01	530995.560564774
2000-07-01	599146.360342430
2000-10-01	617808.667587120
2001-01-01	544974.718429787
2001-04-01	631613.939144137
2001-07-01	672951.926506302
2001-10-01	610492.493292404
2002-01-01	527432.574442012
2002-04-01	735249.111712385
2002-07-01	485259.017952371
2002-10-01	556881.885590163
2003-01-01	734063.381143673
2003-04-01	689044.758942467
2003-07-01	710584.702995205
2003-10-01	676283.501687898
2004-01-01	847757.702589378
2004-04-01	741223.501523036
2004-07-01	920483.421327056
2004-10-01	844236.985367383
2005-01-01	797122.611320065
2005-04-01	913910.744275466
2005-07-01	826432.975729289
2005-10-01	817062.863990213
2006-01-01	960494.968820327
2006-04-01	914513.957105737
2006-07-01	875625.672335745
2006-10-01	1168640.730474170
2007-01-01	890383.196871354
2007-04-01	873991.580897163
2007-07-01	913078.026635983
2007-10-01	1181576.286207790
2008-01-01	1096280.841341280
2008-04-01	893291.702644216
2008-07-01	1013621.305927980
2008-10-01	723891.656460868
2009-01-01	1031386.031563360
2009-04-01	1164778.094499130
2009-07-01	625813.988726206
2009-10-01	583425.678654543
2010-01-01	503097.468256282
2010-04-01	492965.827965916
2010-07-01	667852.512220650
2010-10-01	685348.092717081
2011-01-01	863984.512674919
2011-04-01	967002.194587981
2011-07-01	882024.268232144
2011-10-01	1018651.861569820
2012-01-01	860999.575949453
2012-04-01	760619.692737824
2012-07-01	775246.837134436
2012-10-01	837784.699098744
2013-01-01	808411.045232218
2013-04-01	825747.403924269
2013-07-01	877831.104859942
2013-10-01	692311.143095701