Year	kt
1960	0
1961	0
1962	0
1963	3.667
1964	3.667
1965	7.334
1966	14.668
1967	7.334
1968	3.667
1969	128.345
1970	165.015
1971	817.741
1972	1628.148
1973	2159.863
1974	2071.855
1975	2541.231
1976	3314.968
1977	3069.279
1978	3091.281
1979	3509.319
1980	3989.696
1981	4411.401
1982	4792.769
1983	5042.125
1984	4789.102
1985	5386.823
1986	5027.457
1987	5489.499
1988	7513.683
1989	10131.921
1990	11382.368
1991	12823.499
1992	13410.219
1993	13153.529
1994	14422.311
1995	17685.941
1996	19794.466
1997	25900.021
1998	26589.417
1999	30436.1
2000	34858.502
2001	37561.081
2002	42947.904
2003	48906.779
2004	57652.574
2005	68352.88
2006	71535.836
2007	72793.617
2008	79955.268
2009	71513.834
2010	71297.481
2011	66273.691
2012	65444.949
2013	59922.447
2014	54201.927
2015	56200.442
2016	57348.213