Year	years
1960	43.82888779516641
1961	44.327609296761146
1962	44.79221739780898
1963	44.96964881205251
1964	45.688396180369175
1965	45.70800350162564
1966	46.07654237777135
1967	46.71206963397455
1968	47.07163168709481
1969	47.33964511156205
1970	46.239227878092436
1971	45.07324445432727
1972	47.98513742176579
1973	48.539584077645834
1974	48.48040138186565
1975	48.43625914521985
1976	48.988558299136535
1977	49.74908718366451
1978	50.26032751895383
1979	50.772407311039466
1980	51.23250938276051
1981	51.5422449586497
1982	51.84895195931574
1983	51.340230876591676
1984	51.61368238809167
1985	51.97062627676364
1986	52.61047112353782
1987	53.25068880777824
1988	53.12493712059841
1989	53.84858542031835
1990	54.14135801862628
1991	53.82401579295257
1992	54.50381020384531
1993	54.950773950563125
1994	55.42004671124598
1995	55.89271097247322
1996	55.969841746180194
1997	56.71432159520268
1998	57.109484039423606
1999	58.19827234818386
2000	58.51754473866193
2001	58.9924364994037
2002	59.51384897154097
2003	60.0858318494903
2004	60.35463103927097
2005	61.068583811700094
2006	61.64090167508662
2007	62.09568993361022
2008	62.197273124133865
2009	63.16434874594579
2010	63.67434219195593
2011	64.40753833970778
2012	64.9656637916554
2013	65.51781628748189
2014	65.83110790374742
2015	66.22432979323587
2016	66.77828929596396
2017	67.19384252031674
2018	67.59020233896821
2019	68.02489513407721
2020	67.47043980975964
2021	67.1679415857136
2022	67.90977060719128