Year	years
1960	37.464
1961	37.695
1962	37.932
1963	35.661
1964	35.984
1965	36.383
1966	36.698
1967	37.024
1968	37.361
1969	37.746
1970	38.025
1971	38.368
1972	38.698
1973	39.034
1974	41.757
1975	42.053
1976	42.419
1977	42.718
1978	43.033
1979	43.39
1980	43.754
1981	44.07
1982	44.374
1983	44.635
1984	44.829
1985	45.104
1986	45.446
1987	45.785
1988	46.321
1989	46.7
1990	47.084
1991	47.465
1992	47.92
1993	48.228
1994	48.156
1995	48.952
1996	49.065
1997	47.997
1998	47.716
1999	48.006
2000	50.121
2001	50.445
2002	50.986
2003	51.405
2004	52.15
2005	52.249
2006	53.371
2007	54.155
2008	54.646
2009	55.541
2010	56.23
2011	56.967
2012	57.69
2013	58.232
2014	58.61
2015	59.128
2016	59.674
2017	60.066
2018	60.502
2019	60.882
2020	59.999
2021	59.652
2022	59.861