Year	Percent
1996	5.29199
1997	5.98667
1998	19.92127
1999	12.08006
2000	3.94553
2001	1.61246
2002	3.12155
2003	2.87272
2004	2.17335
2005	0.13033
2006	1.26949
2007	0.54679
2008	2.8257
2009	4.90118
2010	4.29846
2011	1.49555