Year	Percent
1995	66.42883
1996	66.98606
1997	68.66488
1998	69.30238
1999	70.23456
2000	69.78296
2001	69.33525
2002	68.40354
2003	67.35553
2004	66.82427
2005	66.73693
2006	66.99234
2007	66.09914
2008	66.38167
2009	69.98474
2010	71.25832
2011	73.91225
2012	75.35314
2013	76.92125
2014	76.53571
2015	76.26536
2016	75.71614