Year	Percent
1995	42.97
1996	47.59
1997	49.47
1998	50.77
1999	50.61
2000	48.81
2001	35.18
2002	19.05
2003	29.94
2004	38.47
2005	36.03
2006	28.03
2007	25.62
2008	41.12
2009	22.07
2010	22.17