Year	kt
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	29.336
1984	216.353
1985	1287.117
1986	2130.527
1987	2706.246
1988	3171.955
1989	3615.662
1990	4162.045
1991	4712.095
1992	4954.117
1993	5610.51
1994	6270.57
1995	7260.66
1996	8555.111
1997	9006.152
1998	9783.556
1999	10285.935
2000	10190.593
2001	10604.964
2002	10597.63
2003	10674.637
2004	10612.298
2005	10076.916
2006	10388.611
2007	9303.179
2008	9328.848
2009	8921.811
2010	10128.254
2011	8514.774
2012	7979.392
2013	7594.357
2014	6420.917
2015	6534.594
2016	6593.266