Year	Years
1970	0.2
1971	0.2
1972	0.2
1973	0.2
1974	0.2
1975	0.2
1976	0.2
1977	0.3
1978	0.3
1979	0.3
1980	0.3
1981	0.3
1982	0.4
1983	0.4
1984	0.4
1985	0.5
1986	0.5
1987	0.5
1988	0.6
1989	0.6
1990	0.7
1991	0.7
1992	0.8
1993	0.8
1994	0.9
1995	0.9
1996	1
1997	1.1
1998	1.1
1999	1.2
2000	1.3
2001	1.3
2002	1.4
2003	1.5
2004	1.6
2005	1.7
2006	1.8
2007	1.9
2008	2
2009	2.1