Year	years
1960	53.469
1961	53.939
1962	54.325
1963	54.785
1964	55.177
1965	55.522
1966	55.92
1967	56.39
1968	56.694
1969	57.173
1970	57.663
1971	58.038
1972	58.425
1973	58.832
1974	59.256
1975	59.525
1976	59.668
1977	59.877
1978	60.265
1979	60.601
1980	61.022
1981	61.452
1982	61.603
1983	61.846
1984	62.256
1985	62.475
1986	62.976
1987	63.352
1988	63.682
1989	63.787
1990	63.939
1991	64.035
1992	63.875
1993	63.804
1994	63.756
1995	63.684
1996	63.596
1997	63.646
1998	64.106
1999	64.518
2000	65.026
2001	65.156
2002	65.385
2003	65.746
2004	66.075
2005	66.068
2006	66.499
2007	66.895
2008	67.407
2009	67.958
2010	68.293
2011	68.567
2012	68.722
2013	68.74
2014	68.614
2015	68.782
2016	68.777
2017	68.916
2018	68.796
2019	69.002
2020	68.687
2021	69.264
2022	69.41