Year	Percent
1995	33.73
1996	42.23
1997	44.23
1998	40.76
1999	41.65
2000	45.61
2001	48.79
2002	47.86
2003	47.18
2004	43.42
2005	42.94
2006	35.91
2007	39.26
2008	37.53
2009	38.35
2010	38.86