Year	years
1960	33.285
1961	33.813
1962	34.297
1963	34.773
1964	35.246
1965	35.702
1966	36.226
1967	36.711
1968	37.214
1969	37.701
1970	38.233
1971	38.76
1972	39.3
1973	39.857
1974	40.397
1975	40.938
1976	41.483
1977	42.044
1978	41.685
1979	41.143
1980	41.72
1981	42.295
1982	40.833
1983	41.38
1984	37.974
1985	38.316
1986	42.909
1987	43.453
1988	46.569
1989	47.61
1990	48.397
1991	49.144
1992	50.32
1993	52.739
1994	53.544
1995	54.087
1996	54.806
1997	55.151
1998	54.818
1999	56.3
2000	56.858
2001	57.344
2002	57.672
2003	58.65
2004	59.216
2005	59.697
2006	60.243
2007	60.909
2008	61.529
2009	61.892
2010	62.408
2011	62.993
2012	63.514
2013	64.027
2014	64.274
2015	64.576
2016	65.096
2017	66.099
2018	66.458
2019	66.677
2020	65.432
2021	65.279
2022	66.213