Year	Percent
1995	54.69
1996	54.07
1997	54.23
1998	54.73
1999	54.02
2000	52.05
2001	51.84
2002	51.48
2003	54.24
2004	54.73
2005	47.66
2006	41.86
2007	36.13
2008	33.89
2009	37.13
2010	41.7