Year	kt
1960	876.413
1961	865.412
1962	792.072
1963	847.077
1964	993.757
1965	773.737
1966	1191.775
1967	1184.441
1968	1063.43
1969	1059.763
1970	1210.11
1971	1272.449
1972	1587.811
1973	1565.809
1974	1554.808
1975	1767.494
1976	1914.174
1977	1807.831
1978	1826.166
1979	1774.828
1980	1705.155
1981	1804.164
1982	2016.85
1983	2497.227
1984	2148.862
1985	2456.89
1986	4022.699
1987	4525.078
1988	4433.403
1989	4781.768
1990	4224.384
1991	4877.11
1992	4187.714
1993	4767.1
1994	5313.483
1995	6318.241
1996	8056.399
1997	7689.699
1998	8577.113
1999	8302.088
2000	10036.579
2001	12783.162
2002	13116.859
2003	12244.113
2004	13699.912
2005	14095.948
2006	14712.004
2007	15089.705
2008	14132.618
2009	13179.198
2010	13234.203
2011	11474.043
2012	11470.376
2013	11221.02
2014	15313.392
2015	16857.199
2016	16248.477