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	3.667
1972	14.668
1973	29.336
1974	36.67
1975	33.003
1976	40.337
1977	33.003
1978	22.002
1979	33.003
1980	33.003
1981	25.669
1982	18.335
1983	14.668
1984	7.334
1985	11.001
1986	11.001
1987	44.004
1988	40.337
1989	62.339
1990	69.673
1991	69.673
1992	40.337
1993	44.004
1994	36.67
1995	33.003
1996	36.67
1997	69.673
1998	231.021
1999	883.747
2000	1103.767
2001	1144.104
2002	1122.102
2003	1265.115
2004	1353.123
2005	1426.463
2006	2082.856
2007	2339.546
2008	2229.536
2009	2218.535
2010	2060.854
2011	1958.178
2012	1987.514
2013	2046.186
2014	2306.543
2015	2390.884
2016	2277.207