Year	Percent
1991-01-01	47.993600000000000
1992-01-01	45.747400000000000
1993-01-01	18.562200000000000
1994-01-01	7.744540000000000
1995-01-01	7.539389999999999
1996-01-01	8.503789999999999
1997-01-01	9.278720000000000
1998-01-01	9.725580000000000
1999-01-01	9.280180000000000
2000-01-01	10.771800000000000
2001-01-01	13.165400000000000
2002-01-01	15.839400000000000
2003-01-01	18.209300000000000
2004-01-01	21.375100000000000
2005-01-01	25.536300000000000
2006-01-01	28.725500000000000
2007-01-01	32.400200000000000
2008-01-01	36.192700000000000
2009-01-01	38.946800000000000
2010-01-01	35.766000000000000
2011-01-01	35.053500000000000
2012-01-01	37.588900000000000
2013-01-01	40.400800000000000
2014-01-01	41.732400000000000
2015-01-01	39.816900000000000
2016-01-01	37.211500000000000