Year	Percent
1995	28.86983
1996	28.22066
1997	29.66862
1998	31.28596
1999	31.38316
2000	31.4882
2001	34.07357
2002	35.07926
2003	32.2286
2004	30.75046
2005	30.07577
2006	30.02957
2007	28.46884
2008	25.82537
2009	25.47715
2010	23.62339
2011	25.53761
2012	25.30438
2013	25.18555
2014	25.28786
2015	38.40423
2016	36.41891