Year	Percent
1993	18.48294
1994	42.62224
1995	22.30198
1996	14.93476
1997	13.8232
1998	14.81886
2000	9.88079
2001	8.04943
2002	10.8862
2003	28.06371
2004	24.17452
2005	34.06994
2006	44.05734
2007	41.75649
2008	30.23834
2009	29.62278
2010	36.1521
2011	24.31802