Year	Years
1970	0.3
1971	0.3
1972	0.3
1973	0.3
1974	0.3
1975	0.4
1976	0.4
1977	0.4
1978	0.4
1979	0.4
1980	0.5
1981	0.5
1982	0.5
1983	0.5
1984	0.6
1985	0.6
1986	0.6
1987	0.7
1988	0.7
1989	0.7
1990	0.8
1991	0.8
1992	0.9
1993	0.9
1994	1
1995	1
1996	1.1
1997	1.1
1998	1.2
1999	1.2
2000	1.3
2001	1.4
2002	1.4
2003	1.5
2004	1.6
2005	1.6
2006	1.7
2007	1.8
2008	1.9
2009	2