Year	Percent
1993-01-01	2.1102600000000000
1994-01-01	2.5757900000000000
1995-01-01	2.4306700000000000
1996-01-01	2.7448099999999998
1997-01-01	2.4934100000000000
1998-01-01	2.3639600000000000
1999-01-01	2.2613700000000000
2000-01-01	3.7526100000000000
2001-01-01	3.9840500000000000
2002-01-01	4.0666100000000000
2003-01-01	3.8129400000000000
2004-01-01	3.7416000000000000
2005-01-01	3.4386600000000000
2006-01-01	3.1938200000000000
2007-01-01	3.0852000000000000
2008-01-01	2.9301000000000000
2009-01-01	3.0149500000000000
2010-01-01	3.1760099999999998
2011-01-01	3.3533600000000000
2012-01-01	3.6854600000000000
2013-01-01	3.7430800000000004
2014-01-01	3.7285300000000000
2015-01-01	4.2561400000000000
2016-01-01	4.2648400000000000
2017-01-01	4.5327100000000000