Year	Percent
1995	17.21
1996	14.37
1997	13.6
1998	14.64
1999	14.54
2000	12.04
2001	14.02
2002	14.92
2003	16.83
2004	16.53
2005	17.24
2006	16.43
2007	16.48
2008	17.9
2009	16.03
2010	16.77