Year	Number of Buildings
1975-01-01	18624.75
1976-01-01	13953.00
1977-01-01	13719.50
1978-01-01	13435.50
1979-01-01	13872.75
1980-01-01	12859.50
1981-01-01	12899.25
1982-01-01	11277.00
1983-01-01	10841.00
1984-01-01	8747.00
1985-01-01	8233.00
1986-01-01	7197.75
1987-01-01	7721.25
1988-01-01	10143.75
1989-01-01	12601.00
1990-01-01	14611.75
1991-01-01	16721.50
1992-01-01	14329.75
1993-01-01	8772.00
1994-01-01	5407.50
1995-01-01	3169.50
1996-01-01	3271.25
1997-01-01	3251.75
1998-01-01	2864.75
1999-01-01	2928.00
2000-01-01	3246.00
2001-01-01	3852.75
2002-01-01	4985.25
2003-01-01	4996.50
2004-01-01	6320.75
2005-01-01	5767.00
2006-01-01	7458.00
2007-01-01	7631.75
2008-01-01	8005.25
2009-01-01	5705.25
2010-01-01	4875.00
2011-01-01	5016.00
2012-01-01	6498.25
2013-01-01	6819.75