Year	kt
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	44.004
1971	165.015
1972	227.354
1973	227.354
1974	476.71
1975	575.719
1976	682.062
1977	627.057
1978	106.343
1979	117.344
1980	139.346
1981	154.014
1982	168.682
1983	740.734
1984	1646.483
1985	3388.308
1986	6538.261
1987	7682.365
1988	6450.253
1989	6897.627
1990	6842.622
1991	13303.876
1992	16017.456
1993	22046.004
1994	22409.037
1995	42042.155
1996	36281.298
1997	35470.891
1998	35969.603
1999	37990.12
2000	49713.519
2001	48620.753
2002	49064.46
2003	61931.963
2004	59266.054
2005	64132.163
2006	69603.327
2007	65492.62
2008	72690.941
2009	65496.287
2010	60857.532
2011	64836.227
2012	66343.364
2013	75378.852
2014	78470.133
2015	77274.691
2016	73585.689