Year	Percent
1982-01-01	15.678900000000000
1983-01-01	16.418200000000000
1984-01-01	15.833100000000000
1985-01-01	14.863400000000000
1986-01-01	15.494000000000002
1987-01-01	17.062800000000000
1988-01-01	19.501300000000000
1989-01-01	21.906400000000000
1990-01-01	22.404400000000000
1991-01-01	21.563300000000000
1992-01-01	22.036500000000000
1993-01-01	21.576600000000000
1994-01-01	22.887900000000000
1995-01-01	20.342700000000000
1996-01-01	21.487700000000000
1997-01-01	20.528900000000000
1998-01-01	18.509400000000000
1999-01-01	18.020700000000000
2000-01-01	18.352600000000000
2001-01-01	20.973900000000000
2002-01-01	23.389600000000000
2003-01-01	22.518200000000000
2004-01-01	21.421900000000000
2005-01-01	20.943300000000000
2006-01-01	22.988500000000000
2007-01-01	24.954500000000000
2008-01-01	25.375000000000000
2009-01-01	27.422400000000000
2010-01-01	31.208000000000002
2011-01-01	32.732000000000000
2012-01-01	36.172500000000000
2013-01-01	35.611999999999995
2014-01-01	40.051800000000000
2015-01-01	42.103200000000000
2016-01-01	46.010600000000000