Year	years
1960	56.919
1961	58.015
1962	59.079
1963	60.162
1964	61.158
1965	62.219
1966	63.075
1967	63.986
1968	64.735
1969	65.677
1970	66.53
1971	67.058
1972	67.421
1973	67.578
1974	67.93
1975	67.892
1976	68.206
1977	68.585
1978	69.012
1979	69.677
1980	70.341
1981	71.081
1982	71.498
1983	72.02
1984	72.61
1985	73.074
1986	73.558
1987	74.11
1988	74.52
1989	74.826
1990	73.281
1991	74.216
1992	75.691
1993	75.794
1994	75.763
1995	75.537
1996	75.618
1997	75.879
1998	76.157
1999	76.416
2000	76.722
2001	76.891
2002	76.982
2003	76.985
2004	76.792
2005	76.903
2006	76.887
2007	77.017
2008	77.145
2009	77.442
2010	77.982
2011	78.464
2012	78.812
2013	79.164
2014	79.445
2015	79.562
2016	79.701
2017	79.781
2018	79.722
2019	79.685
2020	76.92
2021	78.673
2022	80.264