Year	Percent
1990-01-01	1.2686500000000000
1991-01-01	1.3684399999999999
1992-01-01	1.5106600000000001
1993-01-01	1.5415400000000000
1994-01-01	1.5229800000000000
1995-01-01	1.5054800000000000
1996-01-01	1.5872000000000000
1997-01-01	1.6466300000000000
1998-01-01	1.6223000000000000
1999-01-01	1.5561100000000000
2000-01-01	1.5607600000000001
2001-01-01	1.5637700000000000
2002-01-01	1.6572400000000000
2003-01-01	1.8922900000000002
2004-01-01	1.8629900000000001
2005-01-01	1.9123299999999999
2006-01-01	1.9280500000000000
2007-01-01	1.9329000000000000
2008-01-01	1.7345599999999999
2009-01-01	1.8762599999999998
2010-01-01	1.8772500000000000
2011-01-01	1.8535000000000000
2012-01-01	1.8520800000000000
2013-01-01	1.8397700000000001
2014-01-01	1.8447300000000000
2015-01-01	1.8315900000000000
2016-01-01	1.8351500000000000