Year	Percent
1980-01-01	11.73780000000000000
1981-01-01	11.87650000000000000
1982-01-01	14.80140000000000000
1983-01-01	14.75430000000000000
1984-01-01	16.08320000000000000
1985-01-01	22.56480000000000000
1986-01-01	29.63760000000000000
1987-01-01	26.43090000000000000
1988-01-01	21.96430000000000000
1989-01-01	20.74820000000000000
1990-01-01	21.32790000000000000
1991-01-01	20.47990000000000000
1992-01-01	17.11510000000000000
1993-01-01	17.52090000000000000
1994-01-01	14.54340000000000000
1995-01-01	9.77028000000000000
1996-01-01	6.90009000000000000
1997-01-01	5.63433000000000000
1998-01-01	6.43685000000000000
1999-01-01	5.31120000000000000
2000-01-01	5.31271000000000000
2001-01-01	4.45416000000000000
2002-01-01	3.79408000000000000
2003-01-01	3.44078000000000000
2004-01-01	2.48291000000000000
2005-01-01	1.44445000000000000
2006-01-01	1.13460000000000000
2007-01-01	0.94674900000000000
2008-01-01	0.58083900000000000
2009-01-01	0.64306500000000000
2010-01-01	0.54221200000000000
2011-01-01	0.48679799999999995
2012-01-01	0.75669900000000000
2013-01-01	0.47738600000000000
2014-01-01	0.61221600000000000
2015-01-01	0.71803400000000010
2016-01-01	0.65661800000000000