Year	Percent
1990	18.20478
1991	8.74633
1992	9.55774
1993	10.81569
2001	4.20364
2002	4.86751
2003	5.58384
2004	7.8488
2005	7.21462
2006	7.97607
2007	13.02954
2008	14.6783
2009	15.12564