Year	Percent
1998	8.42882
1999	10.08398
2000	11.49184
2001	12.11209
2002	12.65627
2003	14.38913
2004	13.81153
2005	13.98002
2006	13.49303
2007	13.64621
2008	13.86003
2009	14.62666
2010	14.70096
2011	14.49919
2012	14.38877
2013	14.66219
2014	14.77034