Year	Percent
1992	11.42361
1993	30.55669
1994	28.01966
1995	22.38802
1996	29.23377
1997	29.61482
1998	14.83448
1999	9.53441
2000	9.67062
2001	10.80704
2002	11.78118
2003	6.44233
2004	5.7754
2005	6.16571
2006	6.89951
2007	5.77185
2008	4.42876
2009	4.52862
2010	4.78901
2011	14.37635