Year	Percent
1995	34.63
1996	30.13
1997	28.25
1998	29.86
1999	29
2000	26.36
2001	23.62
2002	23.8
2003	15.29
2004	15.27
2005	15.27
2006	15.23
2007	15.21
2008	15.15
2009	15.82
2010	16.01