Year	Percent
1995	22.24
1996	19.4
1997	11.61
1998	12.65
1999	20.98
2000	20.47
2001	17.53
2002	16.06
2003	12.47
2004	12.29
2005	12.89
2006	11.65
2007	11.65
2008	13.91
2009	20.24
2010	20.35