Year	Percent
1995	26.43
1996	26.89
1997	30.22
1998	28.8
1999	30.57
2000	26.85
2001	27.33
2002	29.5
2003	29.18
2004	25.89
2005	25.29
2006	21.04
2007	19.54
2008	17.18
2009	21.76
2010	21.74