Year	Percent
1970-01-01	0.36119300000000000
1971-01-01	0.28215500000000004
1972-01-01	0.26293400000000000
1973-01-01	0.28891000000000000
1974-01-01	0.29166600000000000
1975-01-01	0.17559100000000000
1976-01-01	0.33243400000000000
1977-01-01	0.41973500000000000
1978-01-01	0.32591800000000000
1979-01-01	0.36148400000000000
1980-01-01	0.31735800000000000
1981-01-01	0.43970100000000000
1982-01-01	0.22326000000000000
1983-01-01	0.18590299999999998
1984-01-01	0.20390500000000000
1985-01-01	0.31523700000000000
1986-01-01	1.19052999999999990
1987-01-01	1.71829000000000000
1988-01-01	1.16798999999999990
1989-01-01	1.18108000000000000
1990-01-01	1.22907000000000000
1991-01-01	2.13630000000000000
1992-01-01	1.29972999999999980
1993-01-01	0.83813400000000000
1994-01-01	1.18520000000000000
1995-01-01	0.88113899999999990
1996-01-01	0.77504700000000000
1997-01-01	0.72522300000000000
1998-01-01	0.81866600000000000
1999-01-01	1.52235000000000000
2000-01-01	1.61195000000000000
2001-01-01	2.09397999999999970
2002-01-01	2.53227000000000000
2003-01-01	3.24870000000000000
2004-01-01	2.72450000000000000
2005-01-01	2.28266000000000000
2006-01-01	2.39815000000000000
2007-01-01	2.15036000000000000
2008-01-01	1.97836000000000000
2009-01-01	1.76410999999999980
2010-01-01	1.40439000000000000
2011-01-01	1.22276000000000000
2012-01-01	1.08713000000000000
2013-01-01	1.17042000000000000
2014-01-01	1.10148000000000000
2015-01-01	1.60527999999999980
2016-01-01	1.75039000000000010
2017-01-01	1.81255000000000000