Year	Percent
1972-01-01	0.5333190000000000
1973-01-01	1.2592400000000000
1974-01-01	1.0104899999999999
1975-01-01	0.8390400000000000
1976-01-01	0.8091680000000000
1977-01-01	0.7385300000000000
1978-01-01	0.9075610000000001
1979-01-01	0.5773119999999999
1980-01-01	0.5225029999999999
1981-01-01	0.4699470000000000
1982-01-01	0.4250750000000000
1983-01-01	0.3868160000000000
1984-01-01	0.5898300000000000
1985-01-01	0.6665960000000000
1986-01-01	0.5082470000000000
1987-01-01	0.4259220000000000
1988-01-01	0.4259220000000000
1989-01-01	0.4259220000000000
1990-01-01	0.4259220000000000
1991-01-01	0.4259220000000000
1992-01-01	0.4259220000000000
1993-01-01	0.4259220000000000
1994-01-01	0.4259220000000000
1995-01-01	9.4263800000000000
1996-01-01	1.1530600000000000
1997-01-01	3.6239999999999997
1998-01-01	5.9644699999999995
1999-01-01	5.1161000000000000
2000-01-01	9.6423300000000010
2001-01-01	18.2110000000000000
2002-01-01	18.7536000000000000
2003-01-01	17.5117000000000000
2004-01-01	22.6481000000000000
2005-01-01	26.7662000000000000
2006-01-01	33.2115000000000000
2007-01-01	45.5393000000000000
2008-01-01	44.9242000000000000
2009-01-01	56.9075000000000000
2010-01-01	59.5907000000000000
2011-01-01	58.1098000000000000
2012-01-01	54.2021000000000000
2013-01-01	67.9651000000000000
2014-01-01	71.9326000000000000
2015-01-01	83.1261000000000000
2016-01-01	87.9070000000000100