Year	years
1960	47.933
1961	48.545
1962	49.225
1963	49.829
1964	50.851
1965	46.589
1966	50.174
1967	52.837
1968	53.45
1969	54.195
1970	54.873
1971	55.505
1972	56.125
1973	56.744
1974	57.299
1975	57.861
1976	58.485
1977	59.097
1978	59.507
1979	60.005
1980	60.609
1981	60.848
1982	61.42
1983	62.049
1984	62.325
1985	62.868
1986	63.338
1987	63.435
1988	63.803
1989	64.309
1990	64.792
1991	65.015
1992	65.627
1993	66.301
1994	66.368
1995	66.794
1996	66.867
1997	67.343
1998	67.458
1999	67.982
2000	67.975
2001	68.509
2002	68.696
2003	69.242
2004	67.113
2005	69.294
2006	69.812
2007	69.929
2008	69.939
2009	70.417
2010	70.434
2011	70.571
2012	70.78
2013	71.346
2014	71.466
2015	71.629
2016	71.751
2017	71.898
2018	72.403
2019	72.597
2020	70.982
2021	69.744
2022	70.437