Year	years
1960	63.767
1961	64.617
1962	65.506
1963	66.396
1964	67.489
1965	68.445
1966	69.357
1967	70.274
1968	71.067
1969	71.965
1970	72.508
1971	73.215
1972	73.511
1973	73.758
1974	74.26
1975	74.5
1976	74.747
1977	74.964
1978	75.389
1979	75.569
1980	75.669
1981	75.815
1982	75.984
1983	75.953
1984	76.002
1985	76.066
1986	76.072
1987	76.111
1988	76.055
1989	75.895
1990	75.97
1991	75.895
1992	75.941
1993	75.835
1994	76.063
1995	76.222
1996	76.542
1997	76.768
1998	76.964
1999	77.237
2000	77.62
2001	78.136
2002	78.433
2003	78.01
2004	77.964
2005	78.369
2006	78.349
2007	78.769
2008	79.088
2009	79.305
2010	79.434
2011	79.706
2012	79.961
2013	80.23
2014	80.535
2015	80.389
2016	80.645
2017	80.721
2018	81
2019	81.171
2020	81.316
2021	80.941
2022	81.645