Year	Percent
1991	2.12
1992	2.19
1993	1.45
1994	1.65
1995	2.01
1996	1.61
1997	1.31
1998	1.28
1999	1.58
2000	1.3
2001	1.15
2002	0.65
2003	0.68
2004	0.5
2005	0.38
2006	0.49
2007	0.52
2008	0.41
2011	0.64
2012	0.64