Year	years
1960	42.48450605828028
1961	45.17492815173839
1962	48.72252995060377
1963	49.18599091043674
1964	49.71831298741575
1965	49.377749314934135
1966	50.22836034676206
1967	50.75983804776222
1968	51.51223574804123
1969	52.01845007208073
1970	52.37367458979301
1971	52.28677271648926
1972	53.67646200350719
1973	54.33862865599665
1974	54.82498978284815
1975	55.42746653410845
1976	56.004281560735954
1977	56.54724205278485
1978	56.98912973488968
1979	57.46878809500698
1980	57.90045075293777
1981	58.27437723049968
1982	58.67681563179581
1983	59.11167645358882
1984	59.54702072341824
1985	59.92363049334678
1986	60.315515082914835
1987	60.642016478672936
1988	60.899704783457615
1989	61.255856916906296
1990	61.49270113219472
1991	61.76247066080593
1992	62.13622838325055
1993	62.40289944782882
1994	62.71810258486061
1995	62.99901452797861
1996	63.29487187420364
1997	63.63246341097467
1998	63.99587551881456
1999	64.37352722680987
2000	64.64586208813614
2001	64.95416633700069
2002	65.2869603000584
2003	65.54563540381322
2004	65.75891238473316
2005	66.12544262472885
2006	66.43269985583964
2007	66.64376441681581
2008	66.81424306583473
2009	67.18797004880633
2010	67.48086121126127
2011	67.81377568141168
2012	68.13518186858634
2013	68.45983332760458
2014	68.83419224857425
2015	69.14415770886966
2016	69.40093143734154
2017	69.58021001265622
2018	69.90769473501052
2019	70.08468887734736
2020	69.31764235658173
2021	68.26914407113443
2022	69.0154030561676