Year	years
1960	65.655
1961	65.974
1962	66.336
1963	66.679
1964	67.038
1965	67.354
1966	67.653
1967	67.95
1968	68.323
1969	68.726
1970	69.008
1971	69.272
1972	69.559
1973	69.662
1974	70.207
1975	70.499
1976	70.904
1977	71.142
1978	71.186
1979	70.911
1980	70.994
1981	71.262
1982	71.777
1983	72.237
1984	72.77
1985	72.89
1986	72.885
1987	72.433
1988	72.681
1989	72.842
1990	73.383
1991	73.592
1992	73.859
1993	73.9
1994	74.025
1995	74.038
1996	73.989
1997	74.424
1998	74.671
1999	74.904
2000	75.187
2001	75.371
2002	75.483
2003	75.666
2004	75.705
2005	76.028
2006	76.176
2007	75.87
2008	75.962
2009	76.071
2010	76.149
2011	75.762
2012	75.922
2013	76.295
2014	76.639
2015	76.372
2016	76.938
2017	77.17
2018	77.32
2019	73.83
2020	76.27
2021	75.096
2022	77.843