Year	kt
1960	6552.929
1961	6857.29
1962	7521.017
1963	8958.481
1964	9068.491
1965	9787.223
1966	10498.621
1967	11151.347
1968	13164.53
1969	11653.726
1970	12420.129
1971	11441.04
1972	2427.554
1973	2933.6
1974	2819.923
1975	3347.971
1976	3630.33
1977	3575.325
1978	3751.341
1979	4209.716
1980	4807.437
1981	4851.441
1982	4704.761
1983	4253.72
1984	4400.4
1985	4840.44
1986	5295.148
1987	5331.818
1988	6006.546
1989	5771.858
1990	5342.819
1991	5269.479
1992	5379.489
1993	5482.165
1994	5896.536
1995	6728.945
1996	7168.985
1997	8415.765
1998	8258.084
1999	8859.472
2000	7693.366
2001	9875.231
2002	9889.899
2003	9875.231
2004	10630.633
2005	10608.631
2006	10931.327
2007	10179.592
2008	9915.568
2009	9999.909
2010	10850.653
2011	13410.219
2012	14891.687
2013	13971.27
2014	15797.436
2015	14701.003
2016	15449.071