Year	Percent
1991-01-01	85.50530000000000
1992-01-01	81.72770000000000
1993-01-01	84.77270000000000
1994-01-01	90.02260000000000
1995-01-01	93.14040000000000
1996-01-01	94.48820000000000
1997-01-01	100.75700000000000
1998-01-01	96.75200000000001
1999-01-01	81.16330000000000
2000-01-01	71.53920000000000
2001-01-01	68.58320000000000
2002-01-01	66.65630000000000
2003-01-01	62.45220000000000
2004-01-01	58.84490000000000
2005-01-01	58.57490000000000
2006-01-01	55.19410000000000
2007-01-01	49.42930000000000
2008-01-01	47.96780000000000
2009-01-01	49.07670000000000
2010-01-01	54.58280000000000
2011-01-01	61.74740000000000
2012-01-01	62.84980000000000
2013-01-01	63.31890000000000
2014-01-01	66.12490000000000
2015-01-01	63.39300000000000
2016-01-01	58.03190000000000