Year	Percent
1995	64.12
1996	64.48
1997	60.69
1998	61.82
1999	61.59
2000	61.91
2001	61.66
2002	59.46
2003	54.54
2004	56.5
2005	52.62
2006	48.67
2007	47.53
2008	51.08
2009	62.97
2010	60.5