Year	Percent
1995	14.93
1996	14.3
1997	15.28
1998	25.1
1999	26.18
2000	26.85
2001	15.09
2002	28.04
2003	27.46
2004	30.41
2005	30.14
2006	29.77
2007	29.66
2008	24.91
2009	16.91
2010	18.79