Year	Percent
1991-01-01	33.871700000000000
1992-01-01	36.863500000000000
1993-01-01	41.131500000000000
1994-01-01	41.992200000000000
1995-01-01	39.491700000000000
1996-01-01	36.301600000000000
1997-01-01	31.996200000000000
1998-01-01	25.814700000000000
1999-01-01	25.814700000000000
2000-01-01	20.716500000000000
2001-01-01	17.173400000000000
2002-01-01	20.851600000000000
2003-01-01	31.850200000000000
2004-01-01	32.465800000000000
2005-01-01	29.519900000000000
2006-01-01	25.676300000000000
2007-01-01	26.123600000000000
2008-01-01	30.621500000000000
2009-01-01	22.817100000000000
2010-01-01	21.943200000000000
2011-01-01	30.451999999999998
2012-01-01	38.205200000000000
2013-01-01	45.837200000000000
2014-01-01	51.819700000000000
2015-01-01	54.841800000000000
2016-01-01	55.008999999999990