Year	Percent
1995	64.00024
1996	65.0767
1997	65.99529
1998	66.38316
1999	64.75394
2000	65.15084
2001	64.47621
2002	64.76828
2003	64.20264
2004	65.60192
2005	67.66155
2006	65.42152
2007	67.17733
2008	69.89138
2009	71.29644
2010	71.61376
2011	71.2336
2012	70.81267
2013	70.82655
2014	70.84376
2015	70.76908
2016	69.46049
2017	68.8804