Year	Age
1970	0.4
1971	0.4
1972	0.5
1973	0.5
1974	0.5
1975	0.6
1976	0.6
1977	0.6
1978	0.7
1979	0.7
1980	0.7
1981	0.8
1982	0.8
1983	0.9
1984	0.9
1985	1
1986	1
1987	1.1
1988	1.1
1989	1.2
1990	1.3
1991	1.3
1992	1.4
1993	1.4
1994	1.5
1995	1.6
1996	1.7
1997	1.7
1998	1.8
1999	1.9
2000	2
2001	2.1
2002	2.1
2003	2.2
2004	2.3
2005	2.4
2006	2.5
2007	2.6
2008	2.7
2009	2.8