Year	years
1960	42.816
1961	43.973
1962	45.096
1963	46.122
1964	47.059
1965	47.772
1966	48.378
1967	49.05
1968	49.614
1969	50.068
1970	50.671
1971	51.359
1972	52.106
1973	52.72
1974	53.312
1975	53.748
1976	53.402
1977	53.399
1978	53.378
1979	53.353
1980	53.372
1981	53.398
1982	53.432
1983	53.846
1984	54.269
1985	54.3
1986	54.434
1987	54.864
1988	55.322
1989	55.763
1990	56.156
1991	56.599
1992	56.969
1993	57.355
1994	57.711
1995	58.102
1996	57.62
1997	58.102
1998	59.137
1999	59.947
2000	60.028
2001	59.714
2002	59.49
2003	59.813
2004	60.379
2005	60.376
2006	61.204
2007	61.71
2008	62.182
2009	62.57
2010	63.01
2011	63.546
2012	64.112
2013	64.594
2014	65.074
2015	65.534
2016	65.881
2017	66.328
2018	66.811
2019	67.254
2020	67.502
2021	66.537
2022	68.079