Year	Percent
1998	36.08043
1999	24.20848
2000	15.7419
2001	17.22572
2002	20.80131
2003	22.34201
2004	22.78564
2005	21.89344
2006	22.2978
2007	22.63517
2008	19.04264
2009	19.6311
2010	18.87649
2012	18.43656
2013	17.40966
2014	5.58524