Year	Percent
1990	18.61576
1991	13.11213
1992	12.15072
1993	16.28054
1994	16.33089
1995	12.16105
1996	15.50164
1997	12.3613
1998	11.96045
1999	9.481
2000	11.84063
2001	10.74612
2002	13.51684
2003	19.359
2004	11.63895
2005	9.51659
2006	21.02967
2007	26.1014
2008	29.82978