Year	kt
1960	11.001
1961	11.001
1962	18.335
1963	22.002
1964	18.335
1965	22.002
1966	25.669
1967	47.671
1968	91.675
1969	139.346
1970	539.049
1971	590.387
1972	810.407
1973	1180.774
1974	1716.156
1975	2504.561
1976	4341.728
1977	7546.686
1978	8441.434
1979	9273.843
1980	9020.82
1981	13109.525
1982	14202.291
1983	14092.281
1984	16175.137
1985	17722.611
1986	16666.515
1987	16226.475
1988	18316.665
1989	19537.776
1990	17638.27
1991	17451.253
1992	20590.205
1993	27513.501
1994	28587.932
1995	22082.674
1996	15405.067
1997	14954.026
1998	19134.406
1999	15320.726
2000	46655.241
2001	34983.18
2002	10318.938
2003	28928.963
2004	29302.997
2005	30454.435
2006	31719.55
2007	33824.408
2008	35096.857
2009	42335.515
2010	28331.242
2011	29801.709
2012	72390.247
2013	67535.139
2014	73273.994
2015	42020.153
2016	52335.424