Year	Percent
1990	3.93873
1991	1.49086
1992	2.20144
1993	2.56725
1994	2.39119
1995	2.7227
1996	2.52164
1997	2.54691
1998	2.60345
1999	3.01818
2000	2.89097
2001	3.37761
2002	3.4295
2003	4.21952
2004	2.43764
2005	2.30199
2006	2.41379
2008	3.47137
2009	4.17761
2010	5.05222
2011	2.79617
2012	0.00133
2013	1.13033