Year	Percent
1995	12.39
1996	12.06
1997	13.09
1998	14.43
1999	17.16
2000	13.33
2001	15.65
2002	11.83
2003	17.87
2004	14.16
2005	16.93
2006	17.79
2007	22.95
2008	23.55
2009	11.66
2010	12.93