Year	Percent
1991-01-01	65.3939971923828
1992-01-01	65.4960021972656
1993-01-01	65.6409988403320
1994-01-01	66.3359985351563
1995-01-01	67.1129989624023
1996-01-01	63.8769989013672
1997-01-01	65.8820037841797
1998-01-01	65.9889984130859
1999-01-01	63.1969985961914
2000-01-01	64.5169982910156
2001-01-01	64.6039962768555
2002-01-01	63.4339981079102
2003-01-01	65.3280029296875
2004-01-01	65.6309967041016
2005-01-01	66.9160003662109
2006-01-01	66.6869964599609
2007-01-01	67.1930007934570
2008-01-01	67.4889984130859
2009-01-01	67.1869964599609
2010-01-01	65.8300018310547
2011-01-01	66.0169982910156
2012-01-01	69.3929977416992
2013-01-01	68.1589965820313
2014-01-01	66.0360031127930
2015-01-01	66.4010009765625
2016-01-01	66.6179962158203
2017-01-01	67.1620025634766