Year	years
1960	43.993486357175584
1961	44.274597971699215
1962	44.72700321049756
1963	44.95898203137488
1964	45.46666422028322
1965	45.578930199343404
1966	45.61956927750423
1967	45.69978400546966
1968	46.129198146610555
1969	46.2533660713396
1970	46.749806984342804
1971	47.376194394539155
1972	47.410074732442865
1973	48.022916589638044
1974	48.18447447386702
1975	48.35053525156468
1976	48.81282397826332
1977	49.30665371070862
1978	49.37630316139985
1979	49.637572973958214
1980	49.80575053531591
1981	49.905808946970026
1982	49.78598498401338
1983	49.26043192155872
1984	49.009751268056036
1985	49.24260011787955
1986	49.84187389028516
1987	50.221502781604606
1988	49.7846322220983
1989	50.91501429063781
1990	50.91116173177179
1991	51.03457423372003
1992	51.040660017270945
1993	51.43377713332655
1994	52.165338854236325
1995	51.815945406943115
1996	51.89583540938624
1997	52.20749324250528
1998	51.91186202261232
1999	52.652252769590405
2000	53.47936261453365
2001	53.74635483632314
2002	54.154940844522244
2003	54.391849081524434
2004	54.6448705416865
2005	55.010821683735294
2006	55.51032887037098
2007	55.973876771752884
2008	56.14065186934741
2009	57.10888011920211
2010	57.427193397876025
2011	58.04399700940767
2012	58.199426047075534
2013	58.43947798454929
2014	58.65528667477789
2015	58.95171518584268
2016	59.17742008525795
2017	59.52656542504803
2018	59.8236347881128
2019	60.142066000069924
2020	59.587721179492235
2021	59.03943971154157
2022	59.58385589822264