Year	Years
1970	0.2
1971	0.2
1972	0.2
1973	0.2
1974	0.2
1975	0.2
1976	0.2
1977	0.2
1978	0.2
1979	0.3
1980	0.3
1981	0.3
1982	0.3
1983	0.3
1984	0.3
1985	0.3
1986	0.4
1987	0.4
1988	0.4
1989	0.5
1990	0.5
1991	0.5
1992	0.6
1993	0.6
1994	0.6
1995	0.7
1996	0.7
1997	0.8
1998	0.8
1999	0.9
2000	0.9
2001	1
2002	1
2003	1.1
2004	1.1
2005	1.2
2006	1.3
2007	1.3
2008	1.4
2009	1.5