Year	years
1960	54.05
1961	54.496
1962	54.999
1963	55.56
1964	56.157
1965	56.827
1966	57.598
1967	58.409
1968	59.175
1969	59.926
1970	60.571
1971	61.176
1972	61.807
1973	62.386
1974	62.962
1975	63.526
1976	64.143
1977	64.655
1978	65.187
1979	65.672
1980	66.158
1981	66.658
1982	67.167
1983	67.677
1984	68.19
1985	68.681
1986	69.147
1987	69.442
1988	69.803
1989	70.039
1990	70.21
1991	70.313
1992	70.824
1993	71.871
1994	70.718
1995	60.894
1996	60.956
1997	60.974
1998	60.906
1999	60.798
2000	60.763
2001	60.745
2002	60.792
2003	69.546
2004	69.437
2005	69.285
2006	69.085
2007	68.911
2008	68.958
2009	69.732
2010	70.419
2011	70.978
2012	71.626
2013	72.319
2014	72.942
2015	72.784
2016	72.805
2017	72.978
2018	73.031
2019	73.198
2020	73.274
2021	73.284
2022	73.578