Year	Percent
1999	17.3394
2000	21.02009
2001	25.18568
2002	25.31278
2003	27.77281
2004	24.5109
2005	22.45786
2007	22.42972
2008	20.2833
2009	21.39928
2010	25.8102
2014	19.19867
2016	27.93029