Year	Age
1970	0.4
1971	0.5
1972	0.5
1973	0.5
1974	0.6
1975	0.6
1976	0.7
1977	0.7
1978	0.8
1979	0.8
1980	0.9
1981	1
1982	1.1
1983	1.1
1984	1.2
1985	1.3
1986	1.4
1987	1.4
1988	1.5
1989	1.6
1990	1.7
1991	1.8
1992	1.9
1993	2
1994	2.1
1995	2.2
1996	2.3
1997	2.5
1998	2.6
1999	2.7
2000	2.8
2001	2.9
2002	3.1
2003	3.2
2004	3.3
2005	3.4
2006	3.6
2007	3.7
2008	3.8
2009	4