Year	years
1960	61.2
1961	61.6
1962	62
1963	62.5
1964	63
1965	63.5
1966	64
1967	64.5
1968	65
1969	65.5
1970	66
1971	66.5
1972	67
1973	67.5
1974	68
1975	68.5
1976	69
1977	69.5
1978	69.825
1979	70.15
1980	70.475
1981	70.8
1982	70.3
1983	71.2
1984	71.7
1985	72.3
1986	72.7
1987	72.5
1988	73.5
1989	71.8
1990	73.2
1991	74.2
1992	75.2
1993	75.6
1994	73.9
1995	75.8
1996	74.2
1997	74.3
1998	77.5
1999	77
2000	78.8
2001	77.7
2002	79.2
2003	78.6
2004	78.8
2005	79
2006	79.2
2007	79.5
2008	79.6
2009	79.9
2010	80.2
2011	79.5
2012	80.1
2013	80.2
2014	79.9
2015	80.2
2016	79.8
2017	80.1
2018	83.821
2019	84.212
2020	84.596
2021	83.082
2022	84.612