Year	Number of Buildings
1960-01-01	30232333333.333298
1961-01-01	31112000000.000000
1962-01-01	33440166666.666702
1963-01-01	35510500000.000000
1964-01-01	38239750000.000000
1965-01-01	42137333333.333300
1966-01-01	46420333333.333300
1967-01-01	47067250000.000000
1968-01-01	50656750000.000000
1969-01-01	53989500000.000000
1970-01-01	52021916666.666700
1971-01-01	55920916666.666700
1972-01-01	64181750000.000000
1973-01-01	76003250000.000000
1974-01-01	87327000000.000000
1975-01-01	85138500000.000000
1976-01-01	99512583333.333300
1977-01-01	115108500000.000000
1978-01-01	131628500000.000000
1979-01-01	147603583333.333000
1980-01-01	156358666666.667000
1981-01-01	168024833333.333000
1982-01-01	162140333333.333000
1983-01-01	175450833333.333000
1984-01-01	192879083333.333000
1985-01-01	195706416666.667000
1986-01-01	195203666666.667000
1987-01-01	209388583333.333000
1988-01-01	228270000000.000000
1989-01-01	239571750000.000000
1990-01-01	244507166666.667000
1991-01-01	238805416666.667000
1992-01-01	237890833333.333000
1993-01-01	246667916666.667000
1994-01-01	266640500000.000000
1995-01-01	285541916666.667000
1996-01-01	297282000000.000000
1997-01-01	314986250000.000000
1998-01-01	317345250000.000000
1999-01-01	329770166666.667000
2000-01-01	346789333333.333000
2001-01-01	322404583333.333000
2002-01-01	318595416666.667000
2003-01-01	331317666666.667000
2004-01-01	357416750000.000000
2005-01-01	397002666666.667000
2006-01-01	424137166666.667000
2007-01-01	449752250000.000000
2008-01-01	454343666666.667000
2009-01-01	350478083333.333000
2010-01-01	407991583333.333000
2011-01-01	459305000000.000000
2012-01-01	475809166666.667000
2013-01-01	485610500000.000000
2014-01-01	493832583333.333000
2015-01-01	453289750000.000000
2016-01-01	441061250000.000000
2017-01-01	464953083333.333000