Year	kt
1960	4374.731
1961	4316.059
1962	4140.043
1963	4129.042
1964	3784.344
1965	4180.38
1966	5977.21
1967	6098.221
1968	6538.261
1969	7876.716
1970	6842.622
1971	7623.693
1972	7264.327
1973	9383.853
1974	9614.874
1975	11301.694
1976	11045.004
1977	13879.595
1978	13175.531
1979	15372.064
1980	18635.694
1981	18169.985
1982	18657.696
1983	22038.67
1984	22786.738
1985	22522.714
1986	22779.404
1987	25111.616
1988	27308.149
1989	25173.955
1990	23223.111
1991	26087.038
1992	28701.609
1993	28015.88
1994	30476.437
1995	27102.797
1996	27429.16
1997	30043.731
1998	33116.677
1999	22207.352
2000	30890.808
2001	28481.589
2002	29519.35
2003	31968.906
2004	32845.319
2005	31077.825
2006	35261.872
2007	38353.153
2008	37392.399
2009	44928.084
2010	45401.127
2011	46959.602
2012	48580.416
2013	51961.39
2014	52900.142
2015	55562.384
2016	53519.865