Year	Number of Buildings
1973-01-01	25215.75002050040
1974-01-01	23113.23514393820
1975-01-01	21775.81184643210
1976-01-01	19447.09821082950
1977-01-01	18867.84391692980
1978-01-01	19053.08695565150
1979-01-01	14473.96399389580
1980-01-01	15507.06577765800
1981-01-01	14950.42495905910
1982-01-01	13298.45212416800
1983-01-01	14115.80963857270
1984-01-01	12042.84243465950
1985-01-01	13922.64796636040
1986-01-01	13058.62196600520
1987-01-01	15053.29072360520
1988-01-01	16068.87698132920
1989-01-01	17436.44274466360
1990-01-01	14554.92325116270
1991-01-01	12409.36581587390
1992-01-01	12311.20145927700
1993-01-01	11915.70049641450
1994-01-01	14084.26599106340
1995-01-01	18304.14725144770
1996-01-01	17471.58209496080
1997-01-01	19312.53396116280
1998-01-01	24243.95643835160
1999-01-01	30573.11315990980
2000-01-01	32063.14725233340
2001-01-01	31665.36197090510
2002-01-01	32245.24115079250
2003-01-01	37743.29237005420
2004-01-01	41120.26119443670
2005-01-01	43264.91654641270
2006-01-01	46101.99791212680
2007-01-01	38176.54000755980
2008-01-01	20932.40607902840
2009-01-01	6812.01205475801
2010-01-01	5336.23998083193
2011-01-01	4406.72860210494
2012-01-01	2917.59145084043
2013-01-01	2446.68067357071
2014-01-01	2667.90583468564
2015-01-01	3722.93303770778
2016-01-01	4757.90082813507