Year	years
1960	50.139
1961	50.902
1962	51.635
1963	52.294
1964	52.832
1965	53.114
1966	53.382
1967	53.47
1968	53.559
1969	53.777
1970	54.276
1971	55.025
1972	55.888
1973	56.798
1974	57.604
1975	58.251
1976	58.743
1977	59.142
1978	59.505
1979	59.661
1980	56.774
1981	60.278
1982	60.229
1983	61.918
1984	62.886
1985	63.854
1986	64.175
1987	65.725
1988	66.701
1989	67.271
1990	68.309
1991	69.066
1992	69.713
1993	70.308
1994	70.889
1995	71.283
1996	71.893
1997	72.559
1998	72.929
1999	73.803
2000	74.248
2001	73.903
2002	74.708
2003	74.682
2004	74.968
2005	75.083
2006	75.401
2007	75.677
2008	75.92
2009	75.961
2010	76.213
2011	76.189
2012	76.163
2013	76.158
2014	76.267
2015	76.572
2016	77.075
2017	77.494
2018	77.488
2019	76.776
2020	75.413
2021	75.149
2022	75.813