Quarter	Number of Buildings
1994-01-01	9835
1994-04-01	9951
1994-07-01	10893
1994-10-01	14475
1995-01-01	10271
1995-04-01	12092
1995-07-01	13468
1995-10-01	13678
1996-01-01	9603
1996-04-01	11590
1996-07-01	11120
1996-10-01	11661
1997-01-01	8510
1997-04-01	8769
1997-07-01	9142
1997-10-01	9359
1998-01-01	7427
1998-04-01	7725
1998-07-01	8488
1998-10-01	9416
1999-01-01	6839
1999-04-01	7613
1999-07-01	8399
1999-10-01	9602
2000-01-01	7290
2000-04-01	7340
2000-07-01	8184
2000-10-01	9699
2001-01-01	7039
2001-04-01	7594
2001-07-01	8407
2001-10-01	9018
2002-01-01	6542
2002-04-01	7862
2002-07-01	8086
2002-10-01	8812
2003-01-01	5874
2003-04-01	8302
2003-07-01	8531
2003-10-01	10166
2004-01-01	6542
2004-04-01	8647
2004-07-01	9896
2004-10-01	11582
2005-01-01	7952
2005-04-01	8748
2005-07-01	9240
2005-10-01	12263
2006-01-01	7797
2006-04-01	9867
2006-07-01	10563
2006-10-01	13307
2007-01-01	9126
2007-04-01	10232
2007-07-01	10938
2007-10-01	13359
2008-01-01	8807
2008-04-01	10544
2008-07-01	10609
2008-10-01	11056
2009-01-01	7723
2009-04-01	9509
2009-07-01	10339
2009-10-01	11096
2010-01-01	8419
2010-04-01	9894
2010-07-01	9954
2010-10-01	12751
2011-01-01	9234
2011-04-01	11592
2011-07-01	11587
2011-10-01	13875
2012-01-01	7783
2012-04-01	9669
2012-07-01	11313
2012-10-01	12786
2013-01-01	7740