Year	years
1960	41.539846554796945
1961	46.09981682342539
1962	52.1982946865871
1963	52.673878357237925
1964	53.330992698125165
1965	53.77563275758979
1966	54.29977881606809
1967	54.733153754985935
1968	55.08085641285634
1969	55.551993901770516
1970	56.28755451740751
1971	57.03079990262338
1972	57.510716141401176
1973	58.31961004912396
1974	58.79184932355025
1975	59.49683837860893
1976	60.13537177674365
1977	60.6939331994356
1978	61.19679357020483
1979	61.67252954809712
1980	62.121642123163035
1981	62.62650213164137
1982	63.05589282231857
1983	63.418927120120394
1984	63.729317412618215
1985	64.08677573171072
1986	64.57189453962576
1987	64.85561317404463
1988	65.05893590739244
1989	65.25927758519708
1990	65.38476475602756
1991	65.67590038216909
1992	65.9613899287894
1993	66.06385409581799
1994	66.2726123789868
1995	66.51942502235337
1996	66.93291073736857
1997	67.39452707712178
1998	67.74662834158451
1999	68.02926002988836
2000	68.24127378398603
2001	68.6120144869057
2002	68.91471564198051
2003	69.31769092071319
2004	69.61721326496226
2005	70.00238641302451
2006	70.45395833237048
2007	70.73412572995143
2008	70.94609420268233
2009	71.36111242048064
2010	71.65170962925325
2011	71.987716605229
2012	72.25158380470852
2013	72.567618429048
2014	72.83781662803158
2015	73.0586759572623
2016	73.26645104433501
2017	73.33120296859131
2018	73.77774592454001
2019	74.0232409624771
2020	73.66789495146564
2021	73.40170544335078
2022	74.15914333343191