Year	Percent
1983-01-01	30.796800000000000
1984-01-01	34.317600000000000
1985-01-01	35.719500000000000
1986-01-01	42.883800000000000
1987-01-01	34.078300000000000
1988-01-01	26.450500000000000
1989-01-01	23.473000000000003
1990-01-01	20.279200000000000
1991-01-01	19.615300000000000
1992-01-01	18.726000000000000
1993-01-01	24.213200000000000
1994-01-01	21.829200000000000
1995-01-01	21.991800000000000
1996-01-01	27.510700000000000
1997-01-01	31.135100000000000
1998-01-01	35.009500000000000
1999-01-01	43.539800000000000
2000-01-01	49.382100000000000
2001-01-01	51.509100000000000
2002-01-01	47.201500000000000
2003-01-01	51.701100000000000
2004-01-01	54.757200000000000
2005-01-01	52.908400000000000
2006-01-01	53.541000000000004
2007-01-01	55.152900000000000
2008-01-01	43.517300000000000
2009-01-01	50.908000000000000
2010-01-01	50.112200000000000
2011-01-01	49.775200000000000
2012-01-01	53.600600000000000
2013-01-01	54.606400000000000
2014-01-01	52.206800000000000
2015-01-01	50.022200000000000
2016-01-01	50.051500000000000