Year	years
1960	57.376
1961	58.962
1962	58.727
1963	57.798
1964	60.249
1965	61.328
1966	63.247
1967	63.541
1968	64.301
1969	64.62
1970	65.362
1971	66.377
1972	67.286
1973	67.695
1974	68.377
1975	68.74
1976	69.612
1977	70.42
1978	71.201
1979	71.636
1980	71.363
1981	71.953
1982	71.906
1983	71.596
1984	72.237
1985	72.389
1986	72.357
1987	72.325
1988	72.796
1989	73.286
1990	73.762
1991	74.283
1992	73.761
1993	74.517
1994	74.1
1995	74
1996	74.8
1997	74.7
1998	74.5
1999	75.3
2000	75.2
2001	76.1
2002	75.6
2003	75.7
2004	75.8
2005	75.9
2006	76.2
2007	75.9
2008	76.5
2009	76.7
2010	77.2
2011	77.2
2012	76.9
2013	77.5
2014	77.5
2015	77.4
2016	77.5
2017	77.9
2018	78.8
2019	78.6
2020	76.7
2021	75.5
2022	76.74