Year	Age
1970	0.5
1971	0.5
1972	0.6
1973	0.6
1974	0.6
1975	0.7
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	1.2
1986	1.2
1987	1.3
1988	1.3
1989	1.4
1990	1.5
1991	1.5
1992	1.6
1993	1.6
1994	1.7
1995	1.8
1996	1.8
1997	1.9
1998	2
1999	2.1
2000	2.1
2001	2.2
2002	2.3
2003	2.3
2004	2.4
2005	2.5
2006	2.6
2007	2.6
2008	2.7
2009	2.8