Year	Percent
1994	50.34627
1995	48.71581
1996	47.22946
1997	48.5108
1998	48.7907
1999	50.15219
2000	49.73588
2001	50.30444
2002	50.44579
2003	52.06374
2004	50.48385
2005	49.85762
2006	53.75926
2007	53.32776
2008	52.89636
2009	54.20051
2010	51.73362
2011	48.45143
2012	48.04351
2013	48.36521
2014	48.54978
2015	49.78252
2016	50.89905
2017	51.03959