Year	Number of Buildings
1972-01-01	7010.50
1973-01-01	7334.50
1974-01-01	7133.75
1975-01-01	6514.25
1976-01-01	5975.25
1977-01-01	5976.75
1978-01-01	5445.75
1979-01-01	6138.50
1980-01-01	7383.25
1981-01-01	6044.00
1982-01-01	6764.50
1983-01-01	6556.25
1984-01-01	6932.00
1985-01-01	6299.75
1986-01-01	6248.75
1987-01-01	6795.75
1988-01-01	7217.50
1989-01-01	6789.00
1990-01-01	7166.50
1991-01-01	7209.00
1992-01-01	7205.25
1993-01-01	6938.00
1994-01-01	9525.50
1995-01-01	11168.00
1996-01-01	10496.75
1997-01-01	11080.75
1998-01-01	13864.00
1999-01-01	14286.00
2000-01-01	14039.00
2001-01-01	13812.00
2002-01-01	16234.75
2003-01-01	14617.75
2004-01-01	12065.00
2005-01-01	12461.25
2006-01-01	11339.00
2007-01-01	11032.50
2008-01-01	10139.75
2009-01-01	8429.75
2010-01-01	7073.00
2011-01-01	6617.75
2012-01-01	6482.75