Year	Percent
1991-01-01	35.063300000000000
1992-01-01	19.697500000000000
1993-01-01	19.449600000000000
1994-01-01	20.315800000000000
1995-01-01	20.910700000000000
1996-01-01	23.794500000000000
1997-01-01	24.148500000000000
1998-01-01	26.467000000000000
1999-01-01	29.504000000000000
2000-01-01	32.580800000000000
2001-01-01	34.571300000000000
2002-01-01	36.048600000000000
2003-01-01	38.021000000000000
2004-01-01	42.497600000000000
2005-01-01	47.244200000000000
2006-01-01	54.127400000000000
2007-01-01	61.943000000000005
2008-01-01	72.000900000000000
2009-01-01	82.004500000000000
2010-01-01	84.507700000000000
2011-01-01	83.237500000000000
2012-01-01	82.316800000000000
2013-01-01	72.976900000000000
2014-01-01	59.162900000000000
2015-01-01	51.365900000000000
2016-01-01	47.281600000000000