Year	years
1960	65.94
1961	66.374
1962	66.843
1963	66.63
1964	67.767
1965	68.205
1966	68.619
1967	69.025
1968	69.429
1969	69.849
1970	70.295
1971	70.798
1972	71.328
1973	71.884
1974	72.448
1975	72.998
1976	73.505
1977	73.942
1978	74.303
1979	74.586
1980	74.929
1981	75.106
1982	75.259
1983	75.429
1984	75.55
1985	75.672
1986	75.799
1987	75.927
1988	76.058
1989	76.179
1990	76.297
1991	76.408
1992	76.531
1993	76.672
1994	76.851
1995	77.08
1996	77.361
1997	77.671
1998	78.003
1999	78.315
2000	78.595
2001	78.831
2002	79.022
2003	79.183
2004	79.321
2005	79.453
2006	79.578
2007	79.694
2008	79.798
2009	79.898
2010	79.99
2011	80.063
2012	80.122
2013	80.157
2014	80.166
2015	80.148
2016	80.111
2017	80.071
2018	80.051
2019	80.075
2020	80.225
2021	76.359
2022	80.565