Year	kt
1992	9064.824
1993	6901.294
1994	4576.416
1995	1690.487
1996	1452.132
1997	1752.826
1998	1745.492
1999	1580.477
2000	2181.865
2001	1859.169
2002	1554.808
2003	1767.494
2004	2383.55
2005	2794.254
2006	3644.998
2007	3289.299
2008	2478.892
2009	2486.226
2010	2324.878
2011	3454.314
2012	3773.343
2013	3531.321
2014	4198.715
2015	4616.753
2016	4330.727