Year	years
1960	41.96
1961	41.743
1962	41.747
1963	42.061
1964	41.863
1965	42.45
1966	43.121
1967	43.498
1968	43.785
1969	44.116
1970	44.419
1971	44.725
1972	44.984
1973	45.19
1974	45.509
1975	45.513
1976	45.627
1977	45.765
1978	45.584
1979	46.167
1980	46.299
1981	46.555
1982	46.776
1983	46.955
1984	47.287
1985	47.389
1986	47.783
1987	48.112
1988	48.843
1989	49.224
1990	49.85
1991	50.181
1992	50.652
1993	51.27
1994	51.554
1995	52.333
1996	51.621
1997	52.626
1998	53.144
1999	53.388
2000	53.81
2001	54.055
2002	54.312
2003	54.597
2004	54.985
2005	55.454
2006	56.081
2007	56.352
2008	56.818
2009	57.463
2010	57.999
2011	58.658
2012	58.81
2013	59.439
2014	60.013
2015	60.254
2016	60.904
2017	61.107
2018	61.767
2019	62.243
2020	61.7
2021	61.521
2022	62.05