Year	Percent
1995	13.18
1996	23.1
1997	22.12
1998	26.95
1999	25.8
2000	20.76
2001	14.49
2002	21.15
2003	18.94
2004	23.96
2005	25.51
2006	20.7
2007	19.82
2008	15.67
2009	10.11
2010	17.54