Year	Percent
1995	40.89
1996	38.11
1997	39.41
1998	33.91
1999	30.02
2000	27.72
2001	26.15
2002	22.74
2003	20.62
2004	22.62
2005	21.29
2006	23.78
2007	23.87
2008	25.26
2009	21.78
2010	21.45