Year	Percent
1980-01-01	12.147500000000000
1981-01-01	13.557600000000000
1982-01-01	16.178600000000000
1983-01-01	16.124600000000000
1984-01-01	16.504800000000000
1985-01-01	17.639400000000000
1986-01-01	21.077200000000000
1987-01-01	20.166900000000000
1988-01-01	18.310200000000000
1989-01-01	16.867800000000000
1990-01-01	17.297400000000000
1991-01-01	19.370300000000000
1992-01-01	20.615500000000000
1993-01-01	24.388200000000000
1994-01-01	27.294100000000000
1995-01-01	27.813000000000002
1996-01-01	27.154500000000000
1997-01-01	26.876200000000000
1998-01-01	31.456000000000000
1999-01-01	30.410700000000000
2000-01-01	25.991300000000000
2001-01-01	28.760700000000000
2002-01-01	29.867300000000000
2003-01-01	29.223700000000000
2004-01-01	27.950700000000000
2005-01-01	25.663900000000000
2006-01-01	25.915800000000000
2007-01-01	28.999300000000000
2008-01-01	28.806400000000000
2009-01-01	38.887100000000000
2010-01-01	37.688200000000000
2011-01-01	36.134000000000000
2012-01-01	37.931400000000000
2013-01-01	40.515700000000000
2014-01-01	42.013900000000000
2015-01-01	49.150300000000000
2016-01-01	53.925700000000000