Year	Percent
1995	21.65
1996	18.09
1997	16.69
1998	14.03
1999	16.98
2000	18.52
2001	19.34
2002	20.09
2003	25.08
2004	18.8
2005	24.27
2006	22.71
2007	16.63
2008	25.42
2009	31.51
2010	31.49