Year	Percent
1995	18.13
1996	20.55
1997	20.12
1998	21
1999	20.62
2000	24.03
2001	18.62
2002	20.2
2003	19.77
2004	20.28
2005	20.2
2006	18.95
2007	21.32
2008	21.75
2009	14.56
2010	19.63