Year	Percent
1991-01-01	55.2019996643066
1992-01-01	56.1189994812012
1993-01-01	57.6549987792969
1994-01-01	59.0289993286133
1995-01-01	60.6240005493164
1996-01-01	61.8699989318848
1997-01-01	63.8590011596680
1998-01-01	63.9830017089844
1999-01-01	65.1620025634766
2000-01-01	63.7239990234375
2001-01-01	66.4280014038086
2002-01-01	67.8199996948242
2003-01-01	69.7170028686523
2004-01-01	70.7699966430664
2005-01-01	71.9020004272461
2006-01-01	73.4609985351563
2007-01-01	74.5790023803711
2008-01-01	74.7740020751953
2009-01-01	75.3059997558594
2010-01-01	76.3259963989258
2011-01-01	75.9000015258789
2012-01-01	76.0619964599609
2013-01-01	75.4380035400391
2014-01-01	74.8960037231445
2015-01-01	73.7870025634766
2016-01-01	73.5830001831055
2017-01-01	73.8960037231445