Year	Percent
1995	21.52
1996	18.19
1997	13.66
1998	15.04
1999	11.22
2000	13.12
2001	15.56
2002	18.77
2003	20.2
2004	19.22
2005	18.6
2006	17.13
2007	18.82
2008	18.11
2009	18.1