Year	years
1960	41.08512157075042
1961	41.43308373672734
1962	41.77260935558191
1963	41.92651921858623
1964	42.579931624779334
1965	42.64014533754231
1966	42.474126614486245
1967	43.236467248141125
1968	43.61834500173676
1969	43.914315695907725
1970	44.249287465021055
1971	44.73115321403595
1972	44.528039719459805
1973	45.273254776242176
1974	45.36436851435735
1975	45.646930824399924
1976	46.35758065450202
1977	46.68983361543076
1978	46.91830076200227
1979	47.35908809040486
1980	47.70533850225828
1981	47.9326268966296
1982	48.02010632854628
1983	46.74429318655434
1984	46.56267758360002
1985	46.962442941163054
1986	47.804248615693375
1987	48.51998682747827
1988	48.05542012519268
1989	49.64479083487699
1990	49.69634663175813
1991	49.69365298790891
1992	49.59358259759851
1993	50.40780404746968
1994	51.126886983386704
1995	50.85319161558504
1996	50.97989011822022
1997	51.44118485025102
1998	51.00856560104039
1999	52.23816694651127
2000	53.21481249431119
2001	53.729475440912786
2002	54.21380923382433
2003	55.30958747548682
2004	55.79377414002128
2005	56.3924136820081
2006	57.24770559693429
2007	57.92882081802378
2008	58.50345761019217
2009	59.219105816255585
2010	59.72513945086628
2011	60.30491200870389
2012	60.557899864509174
2013	60.92835208075893
2014	61.31160575728939
2015	61.699518413970566
2016	62.21424114992841
2017	62.623713909070936
2018	62.995203917953226
2019	63.4239909431004
2020	62.95453253646142
2021	62.49610950800659
2022	63.011310391923914