Year	years
1960	56.86582643799203
1961	57.22146159839703
1962	58.1342936549721
1963	58.592297358801474
1964	59.26459622933096
1965	59.53173504191125
1966	59.79518776369776
1967	60.12350389145812
1968	60.46214559007153
1969	60.65787101681079
1970	60.84416552663237
1971	61.00532750837656
1972	61.16074966022003
1973	61.3001037991752
1974	61.61682759592017
1975	61.86015307327201
1976	62.05415519690439
1977	62.19384297790068
1978	62.402052912106825
1979	62.60193987336707
1980	62.85111828804849
1981	63.15070366043374
1982	63.40796153543851
1983	63.36229000158927
1984	63.78460234338897
1985	63.874109668428304
1986	63.789945301497205
1987	63.906236151201114
1988	64.09350637091926
1989	64.29747080137321
1990	64.5063164230482
1991	64.53309756091429
1992	64.75848249722202
1993	65.0330625788145
1994	65.16364100741674
1995	65.06977793507905
1996	65.0647638446448
1997	65.15997034924992
1998	65.32226013823374
1999	65.50154406382124
2000	65.67538760001894
2001	65.77476970305999
2002	65.87948727645241
2003	65.91963204266499
2004	66.26759586265163
2005	66.57870465229443
2006	66.96354373269642
2007	67.37038637028455
2008	67.63029040262387
2009	67.90417098695599
2010	68.07142325199153
2011	68.2095422926216
2012	68.38835238233324
2013	68.48989940696147
2014	68.64830990191403
2015	68.86864745578134
2016	69.17791016743298
2017	69.37363143561375
2018	69.58662711947638
2019	69.37371913479504
2020	69.14898637094947
2021	67.40863839826704
2022	67.92645987150296