Year	Percent
1978-01-01	24.302500000000000
1979-01-01	32.081600000000000
1980-01-01	44.258200000000000
1981-01-01	64.523200000000000
1982-01-01	75.572500000000000
1983-01-01	60.993300000000000
1984-01-01	56.059400000000000
1985-01-01	74.108700000000000
1986-01-01	89.466000000000010
1987-01-01	77.213400000000000
1988-01-01	66.431000000000000
1989-01-01	75.834300000000000
1990-01-01	80.587400000000000
1991-01-01	62.248200000000000
1992-01-01	46.588100000000000
1993-01-01	41.740400000000000
1994-01-01	42.660000000000000
1995-01-01	43.663999999999994
1996-01-01	42.652900000000000
1997-01-01	41.702600000000000
1998-01-01	47.350700000000000
1999-01-01	53.707000000000000
2000-01-01	54.412200000000000
2001-01-01	52.386000000000000
2002-01-01	52.013900000000000
2003-01-01	53.123200000000000
2004-01-01	50.850200000000000
2005-01-01	52.796800000000000
2006-01-01	63.022400000000000
2007-01-01	78.862200000000000
2008-01-01	95.732100000000000
2009-01-01	91.372999999999990
2010-01-01	75.000900000000000
2011-01-01	63.629900000000000
2012-01-01	53.834900000000000
2013-01-01	50.200900000000000
2014-01-01	52.924400000000000
2015-01-01	56.002300000000000
2016-01-01	55.999800000000000