Year	Percent
1995	13.78
1996	13.98
1997	19.46
1998	16.86
1999	17.59
2000	18.26
2001	17.21
2002	20.27
2003	20.96
2004	19.46
2005	20.32
2006	22.36
2007	28.01
2008	24.52
2009	29.35
2010	28.45