Year	Percent
1999	8.90157
2000	10.09353
2001	13.45257
2002	11.70529
2003	10.99731
2008	14.08204
2009	16.25969
2010	11.03829
2011	11.42989
2012	11.65632
2013	11.50048
2014	13.57499
2015	13.01014