Year	Percent
1995	26.3
1996	24.69
1997	24.86
1998	21.34
1999	22.43
2000	24.78
2001	23.61
2002	24.69
2003	17.4
2004	17.35
2005	16.45
2006	20.72
2007	23.5
2008	23.34
2009	22.79
2010	22.16