Year	years
1960	36.218
1961	36.736
1962	36.708
1963	36.568
1964	37.667
1965	38.249
1966	39.057
1967	39.891
1968	40.71
1969	42.157
1970	43.153
1971	43.934
1972	44.91
1973	45.724
1974	46.658
1975	47.554
1976	48.647
1977	49.526
1978	50.576
1979	51.643
1980	52.872
1981	53.892
1982	54.439
1983	56.128
1984	57.101
1985	57.718
1986	58.214
1987	59.071
1988	59.76
1989	60.139
1990	60.57
1991	61.054
1992	61.32
1993	61.701
1994	61.876
1995	62.3
1996	62.433
1997	62.999
1998	63.283
1999	63.921
2000	64.552
2001	65.166
2002	65.855
2003	66.514
2004	66.849
2005	67.411
2006	68.028
2007	68.584
2008	68.867
2009	69.317
2010	69.397
2011	69.49
2012	69.414
2013	69.528
2014	69.442
2015	68.899
2016	68.941
2017	68.962
2018	68.601
2019	68.627
2020	67.885
2021	67.134
2022	67.222