Year	Percent
1965-01-01	0.25249699999999997
1966-01-01	0.56091000000000000
1967-01-01	0.83851500000000000
1968-01-01	1.21894000000000000
1969-01-01	1.80810000000000000
1970-01-01	0.76533600000000000
1971-01-01	0.35936900000000000
1972-01-01	0.65019300000000000
1973-01-01	0.95406499999999990
1974-01-01	0.85130500000000000
1975-01-01	2.66807000000000000
1976-01-01	4.42106999999999900
1977-01-01	3.85425000000000000
1978-01-01	3.36821999999999950
1979-01-01	5.16669000000000000
1980-01-01	4.72463000000000000
1981-01-01	7.03222000000000000
1982-01-01	9.79236000000000000
1983-01-01	10.81610000000000000
1984-01-01	10.04350000000000000
1985-01-01	9.20554000000000000
1986-01-01	10.45030000000000000
1987-01-01	11.52880000000000000
1988-01-01	9.49998000000000000
1989-01-01	7.73487000000000000
1990-01-01	7.22670000000000000
1991-01-01	5.28404000000000000
1992-01-01	6.72209000000000000
1993-01-01	6.22653000000000000
1994-01-01	6.50483000000000000
1995-01-01	4.04876000000000000
1996-01-01	1.93652000000000000
1997-01-01	1.28302000000000000
1998-01-01	2.35207000000000000
1999-01-01	2.61322000000000000
2000-01-01	1.10233999999999990
2001-01-01	1.52014000000000000
2002-01-01	3.60722000000000000
2003-01-01	4.47918000000000000
2004-01-01	4.39953000000000000
2005-01-01	4.80168000000000000
2006-01-01	3.46426999999999950
2007-01-01	3.00454000000000000
2008-01-01	7.19086999999999900
2009-01-01	11.16940000000000000
2010-01-01	10.14830000000000000
2011-01-01	9.66828999999999900
2012-01-01	9.39857000000000000
2013-01-01	7.92639000000000000
2014-01-01	5.94850000000000000
2015-01-01	4.52157000000000000
2016-01-01	7.87211000000000000