Quarter	Number of Buildings
1994-01-01	47566
1994-04-01	53921
1994-07-01	57995
1994-10-01	56173
1995-01-01	55662
1995-04-01	55375
1995-07-01	52879
1995-10-01	48013
1996-01-01	46302
1996-04-01	45432
1996-07-01	43347
1996-10-01	39632
1997-01-01	38242
1997-04-01	37449
1997-07-01	36206
1997-10-01	34019
1998-01-01	34265
1998-04-01	36314
1998-07-01	36694
1998-10-01	34604
1999-01-01	34035
1999-04-01	35939
1999-07-01	35948
1999-10-01	34683
2000-01-01	35002
2000-04-01	36200
2000-07-01	36787
2000-10-01	34843
2001-01-01	35333
2001-04-01	35883
2001-07-01	34502
2001-10-01	35620
2002-01-01	36278
2002-04-01	36066
2002-07-01	37150
2002-10-01	36109
2003-01-01	39174
2003-04-01	41509
2003-07-01	42923
2003-10-01	41546
2004-01-01	44057
2004-04-01	46792
2004-07-01	47438
2004-10-01	46333
2005-01-01	46641
2005-04-01	52242
2005-07-01	54982
2005-10-01	52515
2006-01-01	56779
2006-04-01	56132
2006-07-01	59560
2006-10-01	57228
2007-01-01	59182
2007-04-01	62221
2007-07-01	62705
2007-10-01	58483
2008-01-01	59458
2008-04-01	60572
2008-07-01	60270
2008-10-01	58122
2009-01-01	61223
2009-04-01	63024
2009-07-01	64388
2009-10-01	63544
2010-01-01	64443
2010-04-01	67419