Year	years
1960	67.783
1961	68.269
1962	68.579
1963	68.992
1964	69.18
1965	69.449
1966	69.901
1967	70.281
1968	70.673
1969	71.135
1970	71.585
1971	72.006
1972	72.785
1973	73.487
1974	73.909
1975	74.284
1976	74.417
1977	74.525
1978	74.615
1979	74.746
1980	74.83
1981	75.298
1982	75.504
1983	75.707
1984	75.855
1985	76.052
1986	76.139
1987	76.117
1988	76.113
1989	76.147
1990	76.196
1991	76.147
1992	76.181
1993	76.218
1994	76.253
1995	76.36
1996	76.403
1997	76.355
1998	76.378
1999	76.466
2000	76.477
2001	76.495
2002	76.555
2003	76.503
2004	76.45
2005	76.56
2006	76.542
2007	76.478
2008	76.944
2009	77.371
2010	78.612
2011	78.62
2012	78.603
2013	78.803
2014	78.614
2015	78.644
2016	78.486
2017	78.794
2018	78.854
2019	79.01
2020	78.445
2021	77.315
2022	77.681