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	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	0
1997	0
1998	0
1999	0
2000	0
2001	1620.814
2002	2291.875
2003	2599.903
2004	3446.98
2005	4382.065
2006	4283.056
2007	3410.31
2008	4730.43
2009	4503.076
2010	4609.419
2011	5328.151
2012	5137.467
2013	4873.443
2014	4404.067
2015	3516.653
2016	3402.976