Year	years
1960	43.429
1961	43.721
1962	44.088
1963	44.414
1964	44.667
1965	45.088
1966	45.474
1967	45.907
1968	46.438
1969	46.982
1970	47.511
1971	47.358
1972	48.528
1973	49.119
1974	49.524
1975	49.87
1976	50.058
1977	50.568
1978	51.049
1979	51.518
1980	51.947
1981	52.262
1982	52.765
1983	53.18
1984	53.703
1985	54.067
1986	54.481
1987	54.775
1988	55.161
1989	55.273
1990	55.498
1991	55.156
1992	54.452
1993	55.774
1994	55.505
1995	56.302
1996	56.186
1997	55.967
1998	56.176
1999	56.427
2000	56.573
2001	56.903
2002	57.215
2003	57.595
2004	57.759
2005	58.316
2006	58.715
2007	59.024
2008	59.365
2009	59.673
2010	60.259
2011	60.433
2012	60.848
2013	61.221
2014	61.641
2015	61.957
2016	62.191
2017	62.797
2018	63.038
2019	63.085
2020	62.694
2021	62.305
2022	62.859