Year	kt
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	190.684
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	223.687
1977	69.673
1978	66.006
1979	69.673
1980	91.675
1981	91.675
1982	95.342
1983	146.68
1984	249.356
1985	297.027
1986	748.068
1987	737.067
1988	1738.158
1989	2849.259
1990	3135.285
1991	3659.666
1992	3784.344
1993	3747.674
1994	4063.036
1995	5122.799
1996	5456.496
1997	8463.436
1998	10949.662
1999	11210.019
2000	11323.696
2001	10373.943
2002	12621.814
2003	12713.489
2004	13179.198
2005	11323.696
2006	11694.063
2007	11507.046
2008	11210.019
2009	13773.252
2010	17872.958
2011	15071.37
2012	11972.755
2013	9838.561
2014	9094.16
2015	7979.392
2016	6959.966