Year	Percent
1990-01-01	18.330100000000000
1991-01-01	16.710100000000000
1992-01-01	13.238200000000000
1993-01-01	10.435100000000000
1994-01-01	8.399050000000000
1995-01-01	6.350340000000000
1996-01-01	4.988160000000000
1997-01-01	5.422760000000000
1998-01-01	6.785489999999999
1999-01-01	9.532340000000000
2000-01-01	11.655500000000000
2001-01-01	14.247000000000000
2002-01-01	15.444600000000000
2003-01-01	14.489800000000000
2004-01-01	14.675200000000000
2005-01-01	13.263100000000000
2006-01-01	16.140200000000000
2007-01-01	17.811300000000000
2008-01-01	15.027300000000000
2009-01-01	22.507600000000000
2010-01-01	22.500600000000000
2011-01-01	22.459000000000000
2012-01-01	27.743600000000000
2013-01-01	29.908300000000000
2014-01-01	29.057300000000000
2015-01-01	29.679300000000000
2016-01-01	27.185100000000000