Year	years
1960	41.447
1961	43.269
1962	45.191
1963	46.559
1964	48.495
1965	50.106
1966	51.65
1967	52.974
1968	54.434
1969	55.575
1970	56.862
1971	58.005
1972	59.194
1973	60.002
1974	61.258
1975	62.772
1976	64.149
1977	65.062
1978	66.001
1979	66.843
1980	67.613
1981	68.152
1982	68.726
1983	69.259
1984	69.542
1985	70.02
1986	70.31
1987	70.857
1988	71.089
1989	71.581
1990	71.829
1991	72.306
1992	72.492
1993	72.623
1994	73.06
1995	73.222
1996	73.369
1997	73.219
1998	73.33
1999	73.162
2000	72.944
2001	73.239
2002	73.498
2003	73.529
2004	73.906
2005	73.991
2006	74.093
2007	74.202
2008	74.794
2009	74.842
2010	74.883
2011	73.859
2012	75.069
2013	74.999
2014	75.301
2015	75.369
2016	75.474
2017	75.674
2018	75.877
2019	75.766
2020	75.348
2021	74.396
2022	74.759