Year	Percent
1998	59.07135
1999	49.41431
2000	47.40924
2001	46.56837
2002	46.22134
2003	42.76821
2004	40.05419
2005	38.18067
2006	36.91716
2007	36.30804
2008	39.10802
2009	42.39225
2010	39.60917
2011	38.4747
2012	40.6447
2013	43.14334
2014	43.82758