Year	Percent
1994	29.88276
1995	35.91121
1996	40.18942
1997	39.99367
1998	49.04871
1999	58.8048
2000	57.84331
2001	50.76538
2002	48.75744
2003	49.26225
2004	47.47565
2005	48.32771
2006	47.25907
2007	44.46308
2008	45.9686
2009	40.50166
2010	42.57703
2011	41.22717
2012	39.12224
2013	37.57322
2014	38.993
2015	39.05567
2016	36.85131
2017	37.45768