Year	Percent
1972-01-01	0.15545200000000000
1973-01-01	0.19929600000000000
1974-01-01	0.17596300000000000
1975-01-01	0.17460300000000000
1976-01-01	0.33076100000000000
1977-01-01	0.89004300000000000
1978-01-01	1.31972000000000000
1979-01-01	1.45886000000000000
1980-01-01	1.47942000000000020
1981-01-01	1.21793000000000000
1982-01-01	1.04053000000000000
1983-01-01	1.30691000000000000
1984-01-01	1.01232000000000000
1985-01-01	1.04870000000000000
1986-01-01	1.02820000000000000
1987-01-01	0.88376100000000000
1988-01-01	0.48123900000000003
1989-01-01	0.49601100000000000
1990-01-01	0.44182100000000000
1991-01-01	0.56364700000000000
1992-01-01	1.49751000000000010
1993-01-01	2.59092000000000000
1994-01-01	10.16590000000000000
1995-01-01	7.75503999999999900
1996-01-01	8.42155000000000000
1997-01-01	9.09319000000000000
1998-01-01	8.69318000000000000
1999-01-01	13.25420000000000000
2000-01-01	13.31250000000000000
2001-01-01	14.73440000000000000
2002-01-01	17.69400000000000300
2003-01-01	18.90670000000000000
2004-01-01	15.93940000000000000
2005-01-01	12.20160000000000000
2006-01-01	10.08730000000000000
2007-01-01	8.65638000000000000
2008-01-01	7.04571999999999900
2009-01-01	8.50302000000000000
2010-01-01	7.94051999999999900
2011-01-01	7.92477000000000000
2012-01-01	10.70060000000000000
2013-01-01	11.89180000000000000
2014-01-01	13.00640000000000000
2015-01-01	16.14080000000000000
2016-01-01	15.99340000000000000