Year	Percent
1967-01-01	0.063197000000000000
1968-01-01	0.063541000000000000
1969-01-01	0.055496000000000004
1970-01-01	0.048922000000000000
1971-01-01	0.206484000000000000
1972-01-01	0.383234000000000000
1973-01-01	0.436080000000000000
1974-01-01	0.402021000000000000
1975-01-01	0.380901000000000050
1976-01-01	0.623597000000000100
1977-01-01	0.979638999999999900
1978-01-01	1.055800000000000000
1979-01-01	1.025140000000000000
1980-01-01	1.071360000000000000
1981-01-01	1.245439999999999900
1982-01-01	1.534290000000000000
1983-01-01	2.257650000000000000
1984-01-01	2.675440000000000000
1985-01-01	3.547930000000000500
1986-01-01	2.939290000000000000
1987-01-01	2.939140000000000000
1988-01-01	2.973830000000000000
1989-01-01	2.928220000000000000
1990-01-01	3.499150000000000000
1991-01-01	3.830800000000000000
1992-01-01	4.370769999999999000
1993-01-01	8.712320000000000000
1994-01-01	10.862700000000000000
1995-01-01	11.834100000000000000
1996-01-01	14.251500000000000000
1997-01-01	16.714700000000000000
1998-01-01	20.886600000000000000
1999-01-01	25.163700000000000000
2000-01-01	31.313100000000000000
2001-01-01	33.192000000000000000
2002-01-01	36.469300000000000000
2003-01-01	41.283100000000000000
2004-01-01	38.987100000000000000
2005-01-01	41.134400000000000000
2006-01-01	56.437000000000000000
2007-01-01	66.746700000000000000
2008-01-01	65.295400000000000000
2009-01-01	79.743300000000000000
2010-01-01	78.863800000000000000
2011-01-01	75.553900000000000000
2012-01-01	88.507700000000000000
2013-01-01	86.781000000000000000
2014-01-01	74.301900000000000000
2015-01-01	76.567400000000000000
2016-01-01	67.728800000000000000