Year	Percent
1995	12.39
1996	15.7
1997	17.45
1998	16.89
1999	19.54
2000	21.36
2001	19.65
2002	19.5
2003	18.82
2004	18.27
2005	16.06
2006	16.98
2007	20.33
2008	18.62
2009	18.3
2010	23.44