Year	years
1960	43.94
1961	44.146
1962	45.513
1963	46.5
1964	47.365
1965	48.428
1966	49.327
1967	50.466
1968	51.573
1969	52.523
1970	53.87
1971	54.835
1972	56.107
1973	57.2
1974	58.282
1975	59.468
1976	60.426
1977	61.543
1978	62.338
1979	63.211
1980	63.975
1981	64.691
1982	65.417
1983	66.137
1984	66.82
1985	67.589
1986	68.228
1987	68.899
1988	69.569
1989	69.671
1990	70.11
1991	70.521
1992	70.701
1993	71.235
1994	71.615
1995	71.988
1996	72.38
1997	72.863
1998	73.169
1999	73.508
2000	73.69
2001	73.816
2002	74.059
2003	74.305
2004	74.49
2005	74.764
2006	74.921
2007	75.072
2008	75.185
2009	75.267
2010	75.421
2011	75.46
2012	75.55
2013	75.65
2014	75.65
2015	75.692
2016	75.786
2017	75.845
2018	75.95
2019	75.993
2020	75.292
2021	73.772
2022	74.263