Year	years
1960	68.323
1961	69.064
1962	69.466
1963	69.804
1964	70.345
1965	70.98
1966	71.253
1967	71.766
1968	71.918
1969	72.428
1970	72.692
1971	72.976
1972	73.399
1973	73.755
1974	74.085
1975	73.49
1976	73.8
1977	74.13
1978	74.16
1979	74.11
1980	74.15
1981	74.15
1982	74.36
1983	74.27
1984	74.27
1985	74.83
1986	75.24
1987	75.24
1988	75.34
1989	75.64
1990	75.93
1991	75.95
1992	75.8
1993	76.04
1994	76.28
1995	76.52
1996	76.76
1997	76.9
1998	76.22
1999	76.55
2000	76.68
2001	78.17
2002	78.4
2003	78.23
2004	79.08
2005	78.83
2006	79.33
2007	79.25
2008	79.6
2009	79.6
2010	79.6
2011	79.9
2012	80.1
2013	80.2
2014	80.5
2015	80.4
2016	81.3
2017	80.9
2018	81.4
2019	81.6
2020	80.9
2021	79.6
2022	80.7