Year	Percent
1975-01-01	0.8332520000000000
1976-01-01	0.8479389999999999
1977-01-01	0.8072120000000000
1978-01-01	0.7023760000000000
1979-01-01	0.7813610000000000
1980-01-01	0.7252920000000000
1981-01-01	0.5851040000000000
1982-01-01	0.8266690000000001
1983-01-01	1.2804300000000000
1984-01-01	1.5648700000000000
1985-01-01	2.0968500000000000
1986-01-01	3.2067900000000003
1987-01-01	4.6133900000000000
1988-01-01	5.0320100000000000
1989-01-01	4.9161400000000000
1990-01-01	4.2150500000000000
1991-01-01	3.2956300000000005
1992-01-01	3.1726500000000000
1993-01-01	3.9412700000000000
1994-01-01	4.8765600000000000
1995-01-01	5.1861400000000000
1996-01-01	6.4684500000000000
1997-01-01	9.3075900000000000
1998-01-01	16.7232000000000000
1999-01-01	20.6178000000000000
2000-01-01	17.3927000000000000
2001-01-01	15.9127000000000000
2002-01-01	15.1171000000000000
2003-01-01	13.7305000000000000
2004-01-01	16.3087000000000000
2005-01-01	23.5867000000000000
2006-01-01	29.6785000000000000
2007-01-01	39.9611000000000000
2008-01-01	42.9329000000000000
2009-01-01	31.3508000000000000
2010-01-01	23.3629000000000000
2011-01-01	20.6371000000000000
2012-01-01	19.8324000000000000
2013-01-01	21.0985000000000000
2014-01-01	20.9910000000000000