Year	years
1960	58.933
1961	59.626
1962	60.443
1963	61.167
1964	62.112
1965	62.85
1966	63.624
1967	64.531
1968	65.242
1969	65.895
1970	66.532
1971	67.133
1972	67.612
1973	68.049
1974	68.552
1975	69.008
1976	69.385
1977	69.837
1978	70.19
1979	70.581
1980	70.801
1981	71.304
1982	71.504
1983	71.709
1984	72.186
1985	72.381
1986	72.587
1987	73.019
1988	73.164
1989	73.594
1990	73.982
1991	73.966
1992	74.122
1993	74.243
1994	74.348
1995	74.25
1996	74.685
1997	74.787
1998	74.809
1999	74.8
2000	74.828
2001	75.263
2002	75.412
2003	75.565
2004	75.961
2005	76.064
2006	76.57
2007	77.016
2008	77.427
2009	77.878
2010	78.425
2011	78.891
2012	79.227
2013	79.536
2014	79.768
2015	80.064
2016	80.433
2017	80.717
2018	80.898
2019	80.99
2020	79.099
2021	79.272
2022	81.559