Year	kt
1960	37696.76
1961	37942.449
1962	41110.737
1963	44913.416
1964	49863.866
1965	52878.14
1966	63149.407
1967	59511.743
1968	69111.949
1969	78019.092
1970	83354.577
1971	76299.269
1972	77421.371
1973	79456.556
1974	72448.919
1975	72173.894
1976	80296.299
1977	79119.192
1978	72687.274
1979	76852.986
1980	64128.496
1981	62808.376
1982	54407.279
1983	49324.817
1984	46394.884
1985	49423.826
1986	48822.438
1987	46849.592
1988	44543.049
1989	42566.536
1990	38375.155
1991	38624.511
1992	38532.836
1993	38532.836
1994	40799.042
1995	41191.411
1996	41283.086
1997	39233.233
1998	40344.334
1999	38899.536
2000	36952.359
2001	37267.721
2002	43208.261
2003	41345.425
2004	39933.63
2005	38378.822
2006	35925.599
2007	34403.794
2008	36490.317
2009	32408.946
2010	38250.477
2011	38554.838
2012	35368.215
2013	32958.996
2014	32412.613
2015	27080.795
2016	32126.587