Year	years
1960	42.692
1961	42.882
1962	43.154
1963	43.372
1964	43.702
1965	43.97
1966	44.373
1967	44.823
1968	45.284
1969	45.666
1970	46.12
1971	46.587
1972	47.089
1973	47.597
1974	48.099
1975	48.729
1976	49.328
1977	49.76
1978	50.232
1979	50.765
1980	51.227
1981	51.764
1982	52.256
1983	52.635
1984	53.089
1985	53.432
1986	53.713
1987	54.051
1988	54.348
1989	54.39
1990	54.37
1991	54.268
1992	54.299
1993	54.195
1994	54.037
1995	54.037
1996	54.098
1997	54.192
1998	54.199
1999	54.538
2000	54.742
2001	54.86
2002	55.311
2003	55.639
2004	55.569
2005	55.962
2006	56.222
2007	56.511
2008	56.695
2009	57.011
2010	57.304
2011	57.925
2012	58.073
2013	58.684
2014	58.853
2015	59.396
2016	59.55
2017	60.154
2018	60.244
2019	60.901
2020	61.035
2021	61.619
2022	61.588