Year	kt
1960	0
1961	451.041
1962	689.396
1963	605.055
1964	1191.775
1965	1778.495
1966	1851.835
1967	1793.163
1968	1884.838
1969	2478.892
1970	135.679
1971	674.728
1972	3138.952
1973	3149.953
1974	2453.223
1975	4462.739
1976	6068.885
1977	3608.328
1978	23875.837
1979	8173.743
1980	25500.318
1981	11173.349
1982	7176.319
1983	16622.511
1984	30535.109
1985	27722.52
1986	33113.01
1987	40149.983
1988	39005.879
1989	36703.003
1990	38939.873
1991	38459.496
1992	31957.905
1993	36127.284
1994	37418.068
1995	47260.296
1996	50608.267
1997	39038.882
1998	54685.971
1999	50963.966
2000	39742.946
2001	41063.066
2002	44689.729
2003	44062.672
2004	41242.749
2005	61260.902
2006	49346.819
2007	51117.98
2008	51591.023
2009	54938.994
2010	53409.855
2011	56768.827
2012	64168.833
2013	65503.621
2014	73893.717
2015	78833.166
2016	78741.491