Year	Percent
1995	44.16
1996	40.91
1997	36.76
1998	40.42
1999	39.9
2000	51.47
2001	49.76
2002	35.14
2003	42.17
2004	48.32
2005	48.4
2006	49.66
2007	48.57
2008	49.7
2009	66.03
2010	66.43