Year	Percent
1995	70.5
1996	49.81
1997	54.72
1998	66.49
1999	70.96
2000	71.19
2001	61.7
2002	58.87
2003	51.58
2004	50.56
2005	56.34
2006	54.24
2007	47.35
2008	46.73
2009	42.33
2010	40.39