Year	kt
1960	5995.545
1961	8096.736
1962	11741.734
1963	14106.949
1964	4345.395
1965	13171.864
1966	11327.363
1967	2027.851
1968	-726.066
1969	1565.809
1970	278.692
1971	344.698
1972	1026.76
1973	1653.817
1974	1752.826
1975	2049.853
1976	4389.399
1977	4228.051
1978	5284.147
1979	4341.728
1980	6505.258
1981	11023.002
1982	10395.945
1983	9875.231
1984	15746.098
1985	16241.143
1986	20003.485
1987	15159.378
1988	16435.494
1989	15848.774
1990	22137.679
1991	13435.888
1992	21037.579
1993	33384.368
1994	39310.24
1995	35063.854
1996	30326.09
1997	35133.527
1998	32115.586
1999	35954.935
2000	31305.179
2001	36306.967
2002	38829.863
2003	37326.393
2004	38958.208
2005	44924.417
2006	45918.174
2007	48096.372
2008	54407.279
2009	61799.951
2010	60054.459
2011	52236.415
2012	64124.829
2013	58312.634
2014	51737.703
2015	51378.337
2016	54685.971