Year	Percent
1998	46.30925
1999	49.83525
2000	48.8117
2001	50.72625
2002	55.13934
2003	59.04268
2004	57.3849
2005	50.31276
2006	48.16911
2007	42.27089
2008	39.80314
2009	42.03798
2010	39.23296
2011	39.66926
2012	39.28183
2013	38.09726
2014	37.67883