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	18.335
1982	40.337
1983	135.679
1984	117.344
1985	73.34
1986	77.007
1987	77.007
1988	55.005
1989	14.668
1990	7.334
1991	3.667
1992	0
1993	0
1994	0
1995	425.372
1996	627.057
1997	1140.437
1998	1899.506
1999	2159.863
2000	3065.612
2001	2566.9
2002	4103.373
2003	5210.807
2004	8767.797
2005	9402.188
2006	11221.02
2007	12489.802
2008	13912.598
2009	15386.732
2010	18063.642
2011	16292.481
2012	17971.967
2013	18734.703
2014	19614.783
2015	20480.195
2016	20384.853