Year	Percent
1995	16.56
1996	19.95
1997	16.64
1998	15.89
1999	17.97
2000	16.73
2001	17.18
2002	17.48
2003	17.83
2004	18.61
2005	19.41
2006	13.39
2007	7.622
2008	6.563
2009	5.755
2010	5.325