Year	years
1960	66.46
1961	67.054
1962	67.539
1963	67.997
1964	68.412
1965	68.816
1966	69.226
1967	69.625
1968	70.108
1969	70.52
1970	70.903
1971	71.294
1972	71.859
1973	72.407
1974	72.881
1975	73.326
1976	73.786
1977	74.256
1978	74.686
1979	75.08
1980	75.471
1981	75.915
1982	76.371
1983	76.767
1984	77.15
1985	77.561
1986	77.942
1987	78.39
1988	78.643
1989	79.1
1990	79.468
1991	80.052
1992	80.51
1993	80.93
1994	81.361
1995	81.799
1996	82.642
1997	82.769
1998	83.177
1999	83.571
2000	83.49
2001	83.955
2002	84.138
2003	84.299
2004	84.498
2005	84.739
2006	85.163
2007	85.496
2008	85.83
2009	86.098
2010	86.164
2011	86.292
2012	86.341
2013	86.831
2014	86.773
2015	86.784
2016	87.018
2017	87.094
2018	87.439
2019	87.573
2020	87.771
2021	87.948
2022	87.98