Year	years
1960	65.41
1961	65.61
1962	65.09
1963	65.52
1964	65.66
1965	65.29
1966	65.96
1967	65.93
1968	65.87
1969	65.64
1970	66.16
1971	65.92
1972	66.6
1973	66.97
1974	66.93
1975	67.42
1976	67.53
1977	67.96
1978	68.58
1979	68.97
1980	69.24
1981	69.61
1982	70.22
1983	70.24
1984	70.48
1985	70.14
1986	70.56
1987	70.67
1988	70.66
1989	70.88
1990	70.94
1991	71.33
1992	71.67
1993	72.11
1994	72.82
1995	72.79
1996	73.03
1997	73.42
1998	73.52
1999	73.74
2000	74.1
2001	74.6
2002	74.9
2003	75.1
2004	75.3
2005	75.5
2006	75.8
2007	75.8
2008	76.3
2009	76.5
2010	76.7
2011	77.3
2012	77.7
2013	78
2014	78.4
2015	78.7
2016	78.6
2017	78.9
2018	79.1
2019	79.3
2020	79.2
2021	79.3
2022	78.7