Year	Percent
1999	41.67946
2000	38.16763
2001	32.87158
2002	35.22849
2003	29.3534
2004	37.90133
2006	37.50974
2007	31.9959
2008	30.94795
2009	24.57943
2011	16.63108
2012	24.2171
2016	25.20772