Year	Percent
1971-01-01	0.1991890000000000
1972-01-01	0.6557250000000000
1973-01-01	0.5800990000000000
1974-01-01	0.5702630000000000
1975-01-01	1.0686400000000000
1976-01-01	1.9995400000000000
1977-01-01	2.8458400000000000
1978-01-01	4.1021700000000000
1979-01-01	3.9334100000000000
1980-01-01	3.5906900000000000
1981-01-01	3.2272900000000000
1982-01-01	3.5322699999999996
1983-01-01	4.5547800000000000
1984-01-01	5.2789600000000000
1985-01-01	8.9421600000000010
1986-01-01	14.0376000000000000
1987-01-01	23.7010000000000000
1988-01-01	21.8523000000000000
1989-01-01	19.6728000000000000
1990-01-01	20.9475000000000000
1991-01-01	20.3825000000000000
1992-01-01	19.2402000000000000
1993-01-01	18.9331000000000000
1994-01-01	20.8439000000000000
1995-01-01	20.0116000000000000
1996-01-01	20.4077000000000000
1997-01-01	17.5158000000000000
1998-01-01	19.9465000000000000
1999-01-01	23.1977000000000000
2000-01-01	24.6191000000000000
2001-01-01	27.9156000000000000
2002-01-01	32.2713000000000000
2003-01-01	38.0764000000000000
2004-01-01	39.6002000000000000
2005-01-01	39.4882000000000000
2006-01-01	50.2326000000000000
2007-01-01	53.7420000000000000
2008-01-01	42.0047000000000000
2009-01-01	56.0664000000000000
2010-01-01	48.8838000000000000
2011-01-01	40.3097000000000000
2012-01-01	39.5018000000000000
2013-01-01	40.6067000000000000
2014-01-01	42.1754000000000000
2015-01-01	45.1039000000000000
2016-01-01	51.2932000000000000