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	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	231.021
1991	223.687
1992	245.689
1993	289.693
1994	480.377
1995	432.706
1996	418.038
1997	462.042
1998	469.376
1999	465.709
2000	443.707
2001	473.043
2002	429.039
2003	487.711
2004	2739.249
2005	3168.288
2006	4587.417
2007	5511.501
2008	6241.234
2009	7066.309
2010	5240.143
2011	1998.515
2012	1510.804
2013	1870.17
2014	619.723
2015	4008.031
2016	6985.635