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