Year	kt
1960	6600.6
1961	6439.252
1962	5625.178
1963	6024.881
1964	6343.91
1965	5845.198
1966	5830.53
1967	5188.805
1968	4844.107
1969	5075.128
1970	4979.786
1971	4543.413
1972	4664.424
1973	5331.818
1974	5588.508
1975	5254.811
1976	5383.156
1977	5218.141
1978	4363.73
1979	3766.009
1980	4011.698
1981	3986.029
1982	4011.698
1983	4319.726
1984	4253.72
1985	4015.365
1986	3490.984
1987	4143.71
1988	4950.45
1989	4184.047
1990	4569.082
1991	4132.709
1992	3685.335
1993	5192.472
1994	4602.085
1995	4462.739
1996	3652.332
1997	4543.413
1998	4407.734
1999	4866.109
2000	4433.403
2001	5452.829
2002	4470.073
2003	6912.295
2004	8236.082
2005	8518.441
2006	7642.028
2007	6556.596
2008	7561.354
2009	5830.53
2010	5192.472
2011	5680.183
2012	6439.252
2013	5665.515
2014	5507.834
2015	5379.489
2016	4532.412