Year	years
1960	61.55
1961	62.363
1962	63.192
1963	64.101
1964	65.058
1965	66.026
1966	66.956
1967	67.859
1968	68.671
1969	69.535
1970	70.058
1971	70.683
1972	71.016
1973	71.349
1974	71.747
1975	71.977
1976	72.359
1977	72.546
1978	72.871
1979	73.035
1980	73.183
1981	73.338
1982	73.458
1983	73.471
1984	73.524
1985	73.566
1986	73.556
1987	73.554
1988	73.53
1989	73.416
1990	73.492
1991	73.435
1992	73.417
1993	73.482
1994	73.591
1995	73.636
1996	73.829
1997	73.96
1998	74.041
1999	74.347
2000	74.606
2001	75.078
2002	75.536
2003	75.478
2004	75.672
2005	75.825
2006	75.765
2007	76.131
2008	76.41
2009	76.669
2010	76.82
2011	77.104
2012	77.35
2013	77.583
2014	77.858
2015	77.913
2016	78.152
2017	78.268
2018	78.511
2019	78.691
2020	78.841
2021	78.497
2022	79.236