Year	Percent
1983-01-01	15.443700000000000
1984-01-01	16.495200000000000
1985-01-01	20.316300000000000
1986-01-01	28.247600000000000
1987-01-01	28.486200000000000
1988-01-01	27.586900000000000
1989-01-01	26.363000000000003
1990-01-01	26.217900000000000
1991-01-01	26.118000000000002
1992-01-01	24.147800000000000
1993-01-01	24.827800000000000
1994-01-01	25.050800000000000
1995-01-01	24.470200000000000
1996-01-01	26.722900000000000
1997-01-01	28.146800000000000
1998-01-01	35.516100000000000
1999-01-01	36.789500000000000
2000-01-01	38.643000000000000
2001-01-01	42.806600000000000
2002-01-01	45.129300000000000
2003-01-01	43.995500000000000
2004-01-01	44.389300000000000
2005-01-01	41.904100000000000
2006-01-01	54.882600000000000
2007-01-01	63.654900000000000
2008-01-01	44.493200000000000
2009-01-01	57.714300000000000
2010-01-01	46.344600000000000
2011-01-01	37.200500000000000
2012-01-01	36.117200000000000
2013-01-01	33.112700000000000
2014-01-01	32.178900000000000
2015-01-01	35.818600000000000
2016-01-01	37.449700000000000