Year	years
1960	71.749
1961	72.38
1962	72.583
1963	72.725
1964	73.352
1965	73.293
1966	73.458
1967	73.725
1968	73.362
1969	73.303
1970	73.547
1971	73.795
1972	74.111
1973	74.334
1974	74.593
1975	74.504
1976	74.958
1977	75.612
1978	75.633
1979	75.962
1980	76.147
1981	76.349
1982	76.645
1983	76.934
1984	77.357
1985	77.461
1986	77.638
1987	78.103
1988	78.286
1989	78.466
1990	78.419
1991	78.7
1992	79.2
1993	79.2
1994	79.6
1995	79.7
1996	79.9
1997	80.3
1998	80.6
1999	80.8
2000	81
2001	81.3
2002	81.2
2003	81.3
2004	81.6
2005	81.8
2006	82
2007	82.3
2008	82.4
2009	82.5
2010	82.6
2011	83.1
2012	83.1
2013	83
2014	83.6
2015	83.1
2016	83.5
2017	83.4
2018	83.3
2019	83.7
2020	83.5
2021	83.3
2022	83.2