Year	years
1960	68.485
1961	67.85
1962	67.973
1963	68.294
1964	68.487
1965	68.555
1966	68.095
1967	69.08
1968	68.721
1969	68.726
1970	68.584
1971	69.29
1972	68.592
1973	68.719
1974	68.638
1975	69.175
1976	69.361
1977	69.493
1978	69.349
1979	69.389
1980	69.932
1981	70.163
1982	70.471
1983	70.404
1984	70.913
1985	70.758
1986	70.847
1987	71.648
1988	71.696
1989	71.744
1990	72.109
1991	72.285
1992	72.679
1993	72.56
1994	73.052
1995	72.762
1996	73.1
1997	73.4
1998	73.4
1999	73.4
2000	74
2001	74.5
2002	75
2003	75.7
2004	76.1
2005	76.7
2006	76.9
2007	77.3
2008	77.9
2009	77.8
2010	78.5
2011	78.6
2012	78.7
2013	78.9
2014	79.3
2015	79.6
2016	79.8
2017	80.4
2018	80.4
2019	80.8
2020	80.8
2021	80.5
2022	81.3