Year	Percent
1991-01-01	64.6269989013672
1992-01-01	64.9209976196289
1993-01-01	64.8219985961914
1994-01-01	67.0599975585938
1995-01-01	66.9690017700195
1996-01-01	66.1679992675781
1997-01-01	68.7119979858398
1998-01-01	68.0790023803711
1999-01-01	67.4150009155273
2000-01-01	67.2229995727539
2001-01-01	66.9860000610352
2002-01-01	67.4010009765625
2003-01-01	68.2060012817383
2004-01-01	69.0029983520508
2005-01-01	68.8190002441406
2006-01-01	69.6409988403320
2007-01-01	68.1890029907227
2008-01-01	70.1940002441406
2009-01-01	69.9980010986328
2010-01-01	70.1470031738281
2011-01-01	70.2249984741211
2012-01-01	67.5009994506836
2013-01-01	67.6480026245117
2014-01-01	69.8570022583008
2015-01-01	64.9879989624023
2016-01-01	65.2969970703125
2017-01-01	65.2939987182617