Year	years
1960	45.506
1961	46.257
1962	46.965
1963	47.431
1964	47.889
1965	48.24
1966	48.338
1967	48.962
1968	49.213
1969	49.511
1970	49.616
1971	46.93
1972	46.967
1973	46.84
1974	46.612
1975	46.267
1976	45.869
1977	45.511
1978	45.207
1979	44.981
1980	42.949
1981	43.09
1982	43.185
1983	43.519
1984	43.752
1985	45.381
1986	45.322
1987	46.619
1988	46.701
1989	46.472
1990	46.443
1991	46.316
1992	46.368
1993	46.237
1994	46.353
1995	46.567
1996	46.67
1997	46.977
1998	47.175
1999	47.786
2000	48.342
2001	49.006
2002	49.648
2003	50.368
2004	51.547
2005	52.976
2006	54.369
2007	55.236
2008	55.823
2009	56.488
2010	57.055
2011	57.965
2012	58.817
2013	59.763
2014	60.408
2015	61.086
2016	61.648
2017	62.115
2018	62.714
2019	62.991
2020	62.851
2021	62.705
2022	63.638