Year	Percent
1994	33.1481
1995	29.52358
1996	26.58963
1997	23.22996
1998	22.98048
1999	24.7448
2000	21.49249
2001	24.02278
2002	20.06862
2003	23.19052
2004	22.011
2005	23.2046
2006	21.06882
2007	20.04613
2008	18.99303
2009	19.53716
2010	20.2309
2011	20.23716
2012	21.90365
2013	20.22764
2014	19.9731
2015	18.8945
2016	19.55876