Year	Percent
1995	27.19
1996	22.5
1997	21.36
1998	25.02
1999	27.24
2000	24.65
2001	26.73
2002	29.1
2003	27.48
2004	26.41
2005	26.67
2006	28.49
2007	29.15
2008	30.77
2009	29.16
2010	29.16