Year	years
1960	49.371
1961	49.97
1962	50.244
1963	51.103
1964	51.625
1965	52.06
1966	52.577
1967	53.062
1968	53.536
1969	53.987
1970	46.816
1971	54.762
1972	55.25
1973	55.531
1974	55.858
1975	56.209
1976	56.512
1977	56.802
1978	57.088
1979	57.336
1980	57.521
1981	57.661
1982	57.658
1983	57.553
1984	57.608
1985	58.578
1986	59.303
1987	60.069
1988	60.863
1989	61.577
1990	62.428
1991	62.843
1992	63.539
1993	64.151
1994	64.775
1995	65.176
1996	65.684
1997	66.138
1998	66.623
1999	67.298
2000	68.03
2001	68.758
2002	69.496
2003	70.16
2004	70.689
2005	71.053
2006	71.243
2007	71.272
2008	71.383
2009	71.398
2010	71.623
2011	72.086
2012	72.513
2013	72.948
2014	73.321
2015	73.577
2016	73.697
2017	73.729
2018	73.8
2019	73.904
2020	70.808
2021	70.121
2022	71.332