Year	Percent
1995	19.27
1996	17.86
1997	17.88
1998	24.74
1999	26.11
2000	26.5
2001	24.23
2002	24.38
2003	26.07
2004	22.09
2005	22.73
2006	21.99
2007	24.93
2008	26.82
2009	25.95
2010	24.96