Year	Percent
1990-01-01	1.3559299999999999
1991-01-01	1.3280800000000000
1992-01-01	1.4978300000000000
1993-01-01	1.6434900000000001
1994-01-01	1.5546100000000000
1995-01-01	1.6766200000000000
1996-01-01	1.6052600000000001
1997-01-01	1.6884099999999997
1998-01-01	1.4339300000000000
1999-01-01	1.4299800000000000
2000-01-01	1.4966800000000000
2001-01-01	1.4753800000000000
2002-01-01	1.4683300000000000
2003-01-01	1.5129200000000000
2004-01-01	1.4870700000000001
2005-01-01	1.4794900000000000
2006-01-01	1.4517700000000000
2007-01-01	1.4930600000000000
2008-01-01	1.5081500000000000
2009-01-01	1.5585300000000000
2010-01-01	1.5938900000000000
2011-01-01	1.6316100000000000
2012-01-01	1.6736900000000001
2013-01-01	1.6682299999999999
2014-01-01	1.6915700000000000
2015-01-01	1.6653000000000000