Year	years
1960	57.45534547203516
1961	58.00586572461255
1962	58.46323755736667
1963	58.886897815584256
1964	59.4147711835779
1965	59.86276560673696
1966	60.262018460196394
1967	60.66707628497423
1968	61.07126353205193
1969	61.43478555937842
1970	61.472883136512316
1971	62.35075233194244
1972	62.76203177698146
1973	63.35295733471647
1974	63.77527083610496
1975	64.37746973189752
1976	64.64905408040457
1977	65.32869595318589
1978	65.77299245086091
1979	66.17554836621999
1980	66.60403965453094
1981	67.16163063023625
1982	67.51957125856221
1983	68.02768707836327
1984	68.44706194403564
1985	68.69483814447972
1986	69.32352737695992
1987	69.78052767519645
1988	70.19837341183282
1989	70.61802335914035
1990	71.01500036571683
1991	71.3849926094601
1992	71.72525890406037
1993	72.06638468156038
1994	72.40929107941413
1995	72.75508190464653
1996	73.11842389332286
1997	73.48396869461301
1998	73.70156402216898
1999	74.11449085933954
2000	74.5640461456347
2001	74.84243279240334
2002	75.16770535173288
2003	75.2661078128883
2004	75.59705114314572
2005	75.92541597919654
2006	76.12905043505344
2007	76.2644143088866
2008	76.46696919576114
2009	76.64338421844404
2010	76.52128478458053
2011	77.00052747123353
2012	77.2492793027402
2013	77.43955183977371
2014	77.60378920433955
2015	77.71638890622702
2016	77.76671627631232
2017	77.83113567255543
2018	77.97540460498224
2019	78.17530963109931
2020	76.59631310836093
2021	75.70064404753116
2022	76.93036498280928