Year	years
1960	54.099
1961	55.414
1962	57.034
1963	58.492
1964	60.105
1965	61.705
1966	63.009
1967	64.053
1968	64.836
1969	65.416
1970	65.752
1971	65.898
1972	65.764
1973	65.683
1974	66.142
1975	66.465
1976	66.673
1977	67.023
1978	67.203
1979	67.79
1980	68.472
1981	68.801
1982	68.927
1983	69.683
1984	69.954
1985	70.353
1986	70.298
1987	70.681
1988	70.247
1989	70.392
1990	69.829
1991	70.233
1992	70.216
1993	70.357
1994	69.863
1995	70.087
1996	69.195
1997	69.015
1998	68.963
1999	68.76
2000	68.808
2001	69.264
2002	69.327
2003	69.821
2004	70.711
2005	71.071
2006	71.489
2007	72.245
2008	72.35
2009	72.571
2010	72.24
2011	72.221
2012	71.665
2013	71.443
2014	71.974
2015	71.99
2016	71.894
2017	71.98
2018	71.816
2019	70.533
2020	69.812
2021	67.354
2022	66.693