Year	years
1960	67.617
1961	68.031
1962	68.031
1963	68.285
1964	68.261
1965	68.493
1966	68.761
1967	68.99
1968	69.035
1969	69.047
1970	69.705
1971	69.493
1972	69.91
1973	70.35
1974	70.747
1975	71.269
1976	71.489
1977	72.173
1978	72.321
1979	72.548
1980	72.549
1981	73.089
1982	73.039
1983	73.21
1984	73.151
1985	73.253
1986	73.638
1987	74.004
1988	74.381
1989	74.735
1990	74.963
1991	75.635
1992	75.719
1993	75.94
1994	76.049
1995	76.243
1996	76.418
1997	76.464
1998	76.758
1999	76.989
2000	77.223
2001	77.59
2002	78.075
2003	77.276
2004	78.103
2005	78.527
2006	78.716
2007	78.515
2008	78.927
2009	79.07
2010	78.838
2011	79.322
2012	79.953
2013	79.927
2014	80.004
2015	80.188
2016	79.67
2017	80.085
2018	80.329
2019	80.681
2020	79.285
2021	78.647
2022	79.277