Year	Percent
1983-01-01	13.859100000000000
1984-01-01	12.569200000000000
1985-01-01	14.357400000000000
1986-01-01	24.612300000000000
1987-01-01	22.969100000000000
1988-01-01	22.282400000000000
1989-01-01	19.453900000000000
1990-01-01	15.094500000000000
1991-01-01	11.850300000000000
1992-01-01	16.692600000000000
1993-01-01	16.125999999999998
1994-01-01	23.003000000000000
1995-01-01	25.801200000000000
1996-01-01	25.522700000000000
1997-01-01	38.708300000000000
1998-01-01	40.438800000000000
1999-01-01	38.933900000000000
2000-01-01	34.852700000000000
2001-01-01	39.932700000000000
2002-01-01	37.465500000000000
2003-01-01	33.762500000000000
2004-01-01	29.321600000000000
2005-01-01	27.611600000000000
2006-01-01	24.138400000000000
2007-01-01	23.560500000000000
2008-01-01	35.166800000000000
2009-01-01	50.257800000000000
2010-01-01	43.027500000000000
2011-01-01	38.599400000000000
2012-01-01	36.813400000000000
2013-01-01	38.424700000000000
2014-01-01	38.888300000000000
2015-01-01	39.488500000000000
2016-01-01	44.570300000000000