Year	Percent
1995	63.51
1996	59.7
1997	60.1
1998	51.64
1999	54.67
2000	60.83
2001	51.12
2002	47.73
2003	47.26
2004	46.43
2005	43.56
2006	53.54
2007	52.97
2008	52.61
2009	51.36
2010	49.93