Year	years
1960	71.169
1961	71.303
1962	71.414
1963	71.518
1964	71.628
1965	71.76
1966	71.912
1967	72.066
1968	72.235
1969	72.386
1970	72.519
1971	72.634
1972	72.734
1973	72.859
1974	72.991
1975	73.15
1976	73.34
1977	73.558
1978	73.805
1979	74.081
1980	74.388
1981	74.72
1982	75.063
1983	75.406
1984	75.738
1985	76.047
1986	76.329
1987	76.586
1988	76.819
1989	77.034
1990	77.236
1991	77.431
1992	77.625
1993	77.826
1994	78.039
1995	78.273
1996	78.526
1997	78.789
1998	79.053
1999	79.308
2000	79.546
2001	79.761
2002	79.949
2003	80.119
2004	80.263
2005	80.376
2006	80.488
2007	80.58
2008	80.675
2009	80.776
2010	80.897
2011	81.032
2012	81.165
2013	81.28
2014	81.36
2015	81.386
2016	81.356
2017	81.316
2018	81.283
2019	81.296
2020	81.911
2021	79.258
2022	81.685