Year	years
1960	39.649
1961	40.079
1962	40.525
1963	40.879
1964	41.336
1965	41.587
1966	41.9
1967	42.177
1968	42.461
1969	42.678
1970	43.081
1971	43.44
1972	43.785
1973	44.168
1974	44.661
1975	45.189
1976	45.664
1977	46.28
1978	46.483
1979	46.869
1980	47.01
1981	47.22
1982	47.604
1983	47.944
1984	48.407
1985	48.847
1986	49.325
1987	49.932
1988	50.551
1989	50.507
1990	51.873
1991	52.753
1992	53.855
1993	54.539
1994	55.454
1995	56.192
1996	57.152
1997	57.808
1998	57.483
1999	54.192
2000	58.383
2001	59.989
2002	60.449
2003	61.15
2004	61.54
2005	62.375
2006	63.272
2007	63.784
2008	64.188
2009	65.081
2010	65.547
2011	66.33
2012	66.658
2013	66.896
2014	67.588
2015	67.981
2016	68.3
2017	68.53
2018	69.115
2019	69.309
2020	69.337
2021	68.655
2022	68.678