Year	years
1960	67.865
1961	67.704
1962	68.387
1963	69.384
1964	69.495
1965	68.489
1966	69.541
1967	70.031
1968	70.002
1969	70.733
1970	71.569
1971	71.453
1972	71.631
1973	71.82
1974	71.961
1975	72.118
1976	72.226
1977	72.235
1978	72.302
1979	72.387
1980	72.487
1981	72.665
1982	73.018
1983	72.624
1984	72.795
1985	72.617
1986	73.449
1987	73.581
1988	74.226
1989	74.233
1990	74.463
1991	75.917
1992	75.327
1993	75.483
1994	75.654
1995	75.821
1996	75.98
1997	76.154
1998	76.326
1999	76.502
2000	76.663
2001	76.847
2002	77.031
2003	77.206
2004	77.384
2005	77.555
2006	77.726
2007	77.892
2008	78.068
2009	78.236
2010	78.406
2011	78.827
2012	79.022
2013	78.908
2014	79.966
2015	79.309
2016	79.475
2017	78.59
2018	80.614
2019	79.983
2020	80.149
2021	80.379
2022	80.55