Year	Number of Buildings
1972-01-01	21509.27216641300
1973-01-01	24773.21004819890
1974-01-01	22967.08795788940
1975-01-01	21707.26950786400
1976-01-01	19931.32993911720
1977-01-01	18549.57410197870
1978-01-01	18982.39146118720
1979-01-01	14307.72252156270
1980-01-01	15612.15073845760
1981-01-01	15092.46808219180
1982-01-01	13737.27286402840
1983-01-01	14095.84122019280
1984-01-01	12197.96426433280
1985-01-01	13418.12288102490
1986-01-01	12956.39066615930
1987-01-01	15158.86962962960
1988-01-01	16337.13490639270
1989-01-01	17226.91564205990
1990-01-01	14450.84803881280
1991-01-01	12305.77623135460
1992-01-01	12708.10924378490
1993-01-01	11894.02627219690
1994-01-01	14180.47301065450
1995-01-01	18263.44379756470
1996-01-01	17330.80388127850
1997-01-01	19483.42131912730
1998-01-01	24581.24921106040
1999-01-01	30815.14721461190
2000-01-01	32214.40891425670
2001-01-01	31614.98403602230
2002-01-01	32770.37096144090
2003-01-01	37559.12983257230
2004-01-01	41467.82673997970
2005-01-01	43237.85053450020
2006-01-01	45888.17775291730
2007-01-01	37183.41780416030
2008-01-01	19829.91666666670
2009-01-01	6685.83333333333
2010-01-01	5257.50000000000
2011-01-01	4329.66666666667
2012-01-01	2881.66666666667
2013-01-01	2436.00000000000
2014-01-01	2676.66666666667
2015-01-01	3771.58333333333
2016-01-01	4831.58333333333