Year	kt
1960	9075.825
1961	10373.943
1962	11100.009
1963	11705.064
1964	15298.724
1965	15133.709
1966	17231.233
1967	18888.717
1968	17311.907
1969	19926.478
1970	22900.415
1971	32115.586
1972	30703.791
1973	32757.311
1974	32632.633
1975	37033.033
1976	37715.095
1977	37946.116
1978	37025.699
1979	35342.546
1980	30645.119
1981	35005.182
1982	45811.831
1983	48272.388
1984	46875.261
1985	46952.268
1986	46981.604
1987	41455.435
1988	44917.083
1989	52918.477
1990	40648.695
1991	41272.085
1992	34781.495
1993	23490.802
1994	31851.562
1995	34011.425
1996	32001.909
1997	44521.047
1998	44623.723
1999	30714.792
2000	33329.363
2001	25907.355
2002	22467.709
2003	39775.949
2004	54282.601
2005	27854.532
2006	53123.829
2007	59376.064
2008	63285.086
2009	77179.349
2010	48268.721
2011	62148.316
2012	51308.664
2013	51117.98
2014	56684.486
2015	60721.853
2016	60424.826