Year	Number of Buildings
1990-01-01	33467.500000000000
1991-01-01	33527.500000000000
1992-01-01	32292.499999999996
1993-01-01	37932.500000000000
1994-01-01	41290.000000000000
1995-01-01	33842.500000000000
1996-01-01	36342.500000000000
1997-01-01	39392.500000000000
1998-01-01	37267.500000000000
1999-01-01	37135.000000000000
2000-01-01	35545.000000000000
2001-01-01	36695.000000000000
2002-01-01	37675.000000000000
2003-01-01	40345.000000000000
2004-01-01	44192.500000000000
2005-01-01	43530.000000000000
2006-01-01	42535.000000000000
2007-01-01	45925.000000000000
2008-01-01	26482.500000000000
2009-01-01	21532.500000000000
2010-01-01	27472.500000000000
2011-01-01	28405.000000000000
2012-01-01	25352.500000000000
2013-01-01	31235.000000000000
2014-01-01	35030.000000000000
2015-01-01	36975.000000000000
2016-01-01	39107.500000000000
2017-01-01	41132.500000000000