Year	Percent
1991	1.79
1992	0.7
1993	1.32
1994	0.79
1995	0.8
1996	0.76
1997	0.57
1998	0.99
2000	0.55
2002	0.34
2003	0.56
2004	0.49
2005	0.48
2006	0.6
2007	0.22
2009	0.55
2011	0.11