Year	years
1960	30.596
1961	30.976
1962	31.361
1963	31.67
1964	32.011
1965	32.759
1966	33.403
1967	34.139
1968	34.624
1969	35.098
1970	35.549
1971	36.103
1972	36.697
1973	37.368
1974	35.362
1975	20.879
1976	21.736
1977	20.517
1978	18.46
1979	18.991
1980	23.599
1981	24.538
1982	25.564
1983	26.279
1984	28.011
1985	28.163
1986	28.686
1987	29.8
1988	30.01
1989	42.984
1990	43.532
1991	43.501
1992	44.803
1993	45.765
1994	46.792
1995	46.537
1996	47.283
1997	47.879
1998	47.503
1999	42.826
2000	57.158
2001	57.929
2002	58.705
2003	59.42
2004	60.129
2005	60.839
2006	61.588
2007	62.208
2008	62.783
2009	63.314
2010	63.769
2011	64.167
2012	64.522
2013	64.84
2014	65.171
2015	65.539
2016	65.869
2017	66.188
2018	66.468
2019	66.721
2020	66.837
2021	66.1
2022	67.435