Year	years
1960	44.08555184549654
1961	44.38669692898199
1962	44.752181869799415
1963	44.913159302389474
1964	45.479043035092545
1965	45.49833778512448
1966	45.249104629175015
1967	45.92490500286339
1968	46.22309657358574
1969	46.432303092012454
1970	46.71848451975787
1971	47.19294226280559
1972	46.897389248458204
1973	47.692317433356436
1974	47.59806375439354
1975	47.759886910285246
1976	48.349588051513734
1977	48.635905194104424
1978	48.76360459955179
1979	49.26133573719398
1980	49.636537663393895
1981	50.05707329139295
1982	50.296849137981205
1983	48.70333059230755
1984	48.65266455523915
1985	49.0116307202704
1986	49.63971900795366
1987	50.075887540827416
1988	49.35972652652426
1989	50.68409978528842
1990	50.60772753372106
1991	50.390459609326314
1992	49.96211364753618
1993	50.27362797123776
1994	50.88258182085698
1995	51.001925289934114
1996	50.81068897051477
1997	50.97423135894741
1998	50.32591274422211
1999	51.237851908381884
2000	51.964481324772564
2001	52.18964821433305
2002	52.54079400419196
2003	53.022034589865925
2004	53.54545710980337
2005	54.21965080585815
2006	55.150546110049575
2007	55.93380171491422
2008	56.680418897396166
2009	57.62085154424316
2010	58.411149750144126
2011	59.29327138893369
2012	60.05078024686726
2013	60.709869561058234
2014	61.337917483240865
2015	61.85645814035946
2016	62.444050201953004
2017	62.92238962335024
2018	63.36586261118311
2019	63.75567791765332
2020	63.31386033068199
2021	62.454589645386356
2022	62.89903064853823