Year	Percent
1990	1.78
1991	1.85
1992	1.86
1993	1.83
1994	1.77
1995	1.76
1996	1.85
1997	1.9
1998	1.88
1999	1.85
2000	1.8
2001	1.74
2002	1.67
2003	1.58
2004	1.42
2005	1.26
2006	1.07
2007	0.89
2008	0.75
2009	0.63
2010	0.55
2011	0.49