Year	Percent
1992	27.35172
1993	19.43513
1994	21.91317
1995	18.81167
1996	16.22737
1997	15.11534
1998	23.36709
1999	22.72234
2000	12.59042
2001	15.16384
2002	13.60181
2003	11.82992
2004	10.64227
2005	22.6
2006	24.6
2007	24.26598
2008	16.77631
2009	14.12423