Year	Percent
1999	23.10233
2000	26.05316
2001	28.42339
2002	24.15314
2003	41.23289
2004	26.44972
2005	36.62896
2006	32.19589
2008	30.48838
2010	30.86393
2011	34.19975
2014	33.02067