Year	kt
1960	0
1961	0
1962	3.667
1963	7.334
1964	7.334
1965	7.334
1966	7.334
1967	7.334
1968	11.001
1969	487.711
1970	2757.584
1971	4103.373
1972	5848.865
1973	6490.59
1974	7715.368
1975	8375.428
1976	9266.509
1977	11059.672
1978	13813.589
1979	15298.724
1980	17685.941
1981	20377.519
1982	22548.383
1983	22808.74
1984	24070.188
1985	30172.076
1986	28114.889
1987	28994.969
1988	29710.034
1989	30370.094
1990	33875.746
1991	31719.55
1992	32848.986
1993	34180.107
1994	35712.913
1995	38345.819
1996	38496.166
1997	38767.524
1998	40344.334
1999	42049.489
2000	44147.013
2001	46519.562
2002	49134.133
2003	46985.271
2004	47080.613
2005	43453.95
2006	52951.48
2007	60696.184
2008	65488.953
2009	67172.106
2010	65136.921
2011	68525.229
2012	65430.281
2013	69313.634
2014	72606.6
2015	73809.376
2016	79122.859