Year	Percent
1975-01-01	5.2733200000000000
1976-01-01	6.8792300000000010
1977-01-01	4.6898000000000000
1978-01-01	0.8945950000000000
1979-01-01	0.8489100000000000
1980-01-01	5.0736099999999995
1981-01-01	5.2510800000000000
1982-01-01	4.8422500000000000
1983-01-01	8.9439400000000000
1984-01-01	7.8369800000000005
1985-01-01	26.5787000000000000
1986-01-01	18.4798000000000000
1987-01-01	17.2475000000000000
1988-01-01	21.8038000000000000
1989-01-01	155.6700000000000000
1990-01-01	209.4909999999999900
1991-01-01	30.5284000000000000
1992-01-01	20.5850000000000000
1993-01-01	29.1148000000000000
1994-01-01	31.3126000000000000
1995-01-01	40.6920000000000000
1996-01-01	33.6238000000000000
1997-01-01	37.3892000000000000
1998-01-01	92.4731000000000000
1999-01-01	67.1572000000000000
2000-01-01	33.0582000000000000
2001-01-01	26.8336000000000000
2002-01-01	21.6283000000000000
2003-01-01	24.8762000000000000
2004-01-01	34.6396000000000000
2005-01-01	40.4276000000000000
2006-01-01	51.8086000000000000
2007-01-01	57.9626000000000000
2008-01-01	59.0626000000000000
2009-01-01	55.3844000000000000
2010-01-01	41.6232000000000000
2011-01-01	35.3358000000000000
2012-01-01	25.6059000000000000
2013-01-01	23.4089000000000000
2014-01-01	26.7984000000000000
2015-01-01	35.9391000000000000
2016-01-01	24.6344000000000000
2017-01-01	29.2837000000000000