Year	Age
1970	0.5
1971	0.5
1972	0.5
1973	0.6
1974	0.6
1975	0.6
1976	0.7
1977	0.7
1978	0.8
1979	0.8
1980	0.9
1981	0.9
1982	1
1983	1
1984	1.1
1985	1.1
1986	1.2
1987	1.3
1988	1.3
1989	1.4
1990	1.5
1991	1.6
1992	1.7
1993	1.8
1994	1.9
1995	2
1996	2.1
1997	2.2
1998	2.3
1999	2.4
2000	2.5
2001	2.6
2002	2.7
2003	2.8
2004	3
2005	3.1
2006	3.2
2007	3.4
2008	3.5
2009	3.6