Year	years
1960	33.578
1961	34.971
1962	36.346
1963	37.566
1964	38.868
1965	40.021
1966	41.195
1967	42.421
1968	43.633
1969	44.742
1970	45.707
1971	46.98
1972	47.114
1973	48.432
1974	49.645
1975	50.859
1976	53.155
1977	54.216
1978	55.655
1979	57.112
1980	58.346
1981	59.532
1982	60.824
1983	62.111
1984	63.237
1985	64.106
1986	64.889
1987	65.9
1988	66.589
1989	67.141
1990	67.819
1991	68.135
1992	68.722
1993	69.262
1994	69.5
1995	70.108
1996	70.283
1997	70.501
1998	70.981
1999	71.202
2000	71.497
2001	71.913
2002	71.963
2003	72.1
2004	72.267
2005	72.315
2006	72.407
2007	72.389
2008	72.525
2009	72.585
2010	74.639
2011	75.106
2012	75.707
2013	75.913
2014	76.097
2015	76.332
2016	76.544
2017	76.525
2018	76.534
2019	76.543
2020	73.289
2021	70.984
2022	72.356