Year	Percent
1995	22.56
1996	23.66
1997	23.52
1998	20.44
1999	23.06
2000	26.27
2001	24.21
2002	29.96
2003	25.84
2004	25.37
2005	19.84
2006	19.22
2007	22.27
2008	23.74
2009	20.85
2010	21.59