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	18.335
1979	1056.096
1980	1686.82
1981	2570.567
1982	3795.345
1983	4066.703
1984	4312.392
1985	4459.072
1986	3113.283
1987	3083.947
1988	3725.672
1989	4202.382
1990	4290.39
1991	4396.733
1992	4349.062
1993	4939.449
1994	5023.79
1995	5346.486
1996	6072.552
1997	6347.577
1998	6417.25
1999	6864.624
2000	7869.382
2001	8206.746
2002	8426.766
2003	8364.427
2004	8349.759
2005	7946.389
2006	9013.486
2007	9706.549
2008	10315.271
2009	9754.22
2010	10744.31
2011	9453.526
2012	9211.504
2013	8800.8
2014	8525.775
2015	8595.448
2016	9713.883