Year	Percent
1994	63.03283
1995	63.19101
1996	63.27144
1997	64.20246
1998	64.92023
1999	65.7501
2000	65.86158
2001	66.89458
2002	68.06413
2003	68.35208
2004	68.50664
2005	68.96489
2006	68.9521
2007	69.08577
2008	69.76605
2009	71.53332
2010	70.20977
2011	71.54418
2012	71.58562
2013	71.3471
2014	70.48722
2015	69.14895
2016	68.77779