Year	years
1960	67.095
1961	67.682
1962	68.272
1963	69.222
1964	69.606
1965	70.555
1966	71.472
1967	71.515
1968	71.981
1969	71.795
1970	71.499
1971	72.568
1972	73.348
1973	73.509
1974	74.129
1975	73.999
1976	74.512
1977	74.332
1978	74.172
1979	73.346
1980	74.901
1981	74.525
1982	74.619
1983	74.82
1984	76.663
1985	77.43
1986	77.88
1987	78.542
1988	80.751
1989	79.889
1990	80.822
1991	81.516
1992	79.306
1993	79.409
1994	76.457
1995	78.225
1996	77.032
1997	77.361
1998	77.463
1999	75.969
2000	76.717
2001	77.013
2002	77.057
2003	76.841
2004	77.8
2005	76.8
2006	76.4
2007	76.9
2008	77.8
2009	77.5
2010	78.5
2011	78.8
2012	78.3
2013	79
2014	78.9
2015	78.6
2016	78.9
2017	79.2
2018	79.3
2019	79.5
2020	78.8
2021	77
2022	78.8