Year	Percent
1990-01-01	2.1785600000000000
1991-01-01	1.7037400000000003
1992-01-01	1.6294000000000000
1993-01-01	1.7366200000000000
1994-01-01	1.5139700000000000
1995-01-01	1.2976299999999998
1996-01-01	1.1048200000000001
1997-01-01	0.9537959999999999
1998-01-01	0.9128910000000000
1999-01-01	0.8842280000000000
2000-01-01	0.9021930000000000
2001-01-01	1.0515400000000000
2002-01-01	1.2559400000000000
2003-01-01	1.1893100000000000
2004-01-01	1.0918000000000000
2005-01-01	1.0481800000000000
2006-01-01	0.9381200000000001
2007-01-01	1.0350500000000000
2008-01-01	1.2684600000000001
2009-01-01	1.1758500000000000
2010-01-01	1.2198500000000000
2011-01-01	1.3839400000000000
2012-01-01	1.4021000000000000
2013-01-01	1.3381200000000000
2014-01-01	1.3662900000000000
2015-01-01	1.4211600000000000
2016-01-01	1.4079899999999999