Year	Percent
1995	45.31
1996	45.93
1997	45.77
1998	45.27
1999	45.98
2000	47.95
2001	48.16
2002	48.52
2003	45.76
2004	45.27
2005	52.34
2006	58.14
2007	63.87
2008	66.11
2009	62.87
2010	58.3