Year	Percent
1995	16.15
1996	16.29
1997	15.63
1998	16.26
1999	15.91
2000	15.36
2001	16.99
2002	16.06
2003	15.6
2004	14.11
2005	14.07
2006	13.84
2007	11.45
2008	11.24
2009	10.63
2010	10.5