Year	Percent
1995	59.72
1996	58.02
1997	57.87
1998	43.39
1999	30.97
2000	35.07
2001	27.98
2002	26.92
2003	26.02
2004	17.3
2005	12.82
2006	13.41
2007	11.97
2008	24.66
2009	28.3
2010	33.29