Year	kt
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	3.667
1980	3.667
1981	3.667
1982	3.667
1983	3.667
1984	0
1985	0
1986	0
1987	44.004
1988	47.671
1989	0
1990	47.671
1991	47.671
1992	80.674
1993	44.004
1994	62.339
1995	77.007
1996	91.675
1997	187.017
1998	179.683
1999	176.016
2000	176.016
2001	146.68
2002	168.682
2003	110.01
2004	25.669
2005	99.009
2006	84.341
2007	80.674
2008	113.677
2009	58.672
2010	77.007
2011	95.342
2012	139.346
2013	194.351
2014	253.023
2015	212.686
2016	311.695