Year	Percent
1995	71.23
1996	69.61
1997	66.89
1998	63.66
1999	60.6
2000	52.75
2001	47.51
2002	57.28
2003	58.17
2004	60.44
2005	61.02
2006	63.73
2007	65.28
2008	67.4
2009	53.21
2010	67.22