Year	kt
1960	5390.49
1961	5559.172
1962	6904.961
1963	6395.248
1964	7000.303
1965	7455.011
1966	7972.058
1967	6780.283
1968	7165.318
1969	7238.658
1970	7293.663
1971	6769.282
1972	5104.464
1973	7356.002
1974	8789.799
1975	12189.108
1976	11400.703
1977	12577.81
1978	12134.103
1979	12625.481
1980	12746.492
1981	13278.207
1982	13542.231
1983	13901.597
1984	11683.062
1985	14851.35
1986	14103.282
1987	16076.128
1988	13960.269
1989	8544.11
1990	11067.006
1991	12005.758
1992	10989.999
1993	8903.476
1994	10920.326
1995	12559.475
1996	14759.675
1997	21543.625
1998	21701.306
1999	20047.489
2000	20733.218
2001	24972.27
2002	27513.501
2003	32001.909
2004	34821.832
2005	39489.923
2006	42779.222
2007	36493.984
2008	43677.637
2009	45525.805
2010	47502.318
2011	59599.751
2012	52309.755
2013	56321.453
2014	70575.082
2015	83259.235
2016	81187.38