Year	years
1960	59.675
1961	59.996
1962	60.271
1963	60.527
1964	60.781
1965	61.045
1966	61.334
1967	61.63
1968	61.909
1969	62.173
1970	62.429
1971	62.681
1972	62.936
1973	63.206
1974	63.501
1975	63.889
1976	64.378
1977	64.936
1978	65.549
1979	66.235
1980	67.14
1981	68.012
1982	68.884
1983	69.804
1984	70.772
1985	71.644
1986	72.471
1987	72.897
1988	73.468
1989	73.787
1990	73.983
1991	74.149
1992	74.419
1993	74.804
1994	75.311
1995	76.008
1996	76.833
1997	77.7
1998	78.386
1999	79.18
2000	79.536
2001	79.685
2002	79.711
2003	79.703
2004	79.696
2005	79.736
2006	79.842
2007	80.02
2008	80.301
2009	80.665
2010	81.039
2011	81.429
2012	81.759
2013	82.017
2014	82.214
2015	82.354
2016	82.488
2017	82.618
2018	82.783
2019	82.996
2020	82.217
2021	79.486
2022	83.55