Year	Percent
1990	0.39
1991	0.51
1992	0.64
1993	0.78
1994	0.93
1995	1.06
1996	1.2
1997	1.34
1998	1.48
1999	1.63
2000	1.74
2001	1.77
2002	1.74
2003	1.65
2004	1.55
2005	1.45
2006	1.36
2007	1.28
2008	1.22
2009	1.19