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	157.681
1986	414.371
1987	553.717
1988	711.398
1989	949.753
1990	1320.12
1991	1411.795
1992	1595.145
1993	1738.158
1994	1727.157
1995	1727.157
1996	1851.835
1997	1829.833
1998	1811.498
1999	1815.165
2000	1778.495
2001	2005.849
2002	2038.852
2003	2035.185
2004	2024.184
2005	1928.842
2006	2020.517
2007	2086.523
2008	1892.172
2009	2493.56
2010	3358.972
2011	2654.908
2012	2306.543
2013	2189.199
2014	1818.832
2015	1657.484
2016	1873.837