Year	kt
1991	333623.66
1992	336696.606
1993	340667.967
1994	335226.139
1995	336263.9
1996	346692.848
1997	340917.323
1998	339773.219
1999	324423.157
2000	316880.138
2001	326883.714
2002	312322.057
2003	304452.675
2004	295292.509
2005	288149.193
2006	288790.918
2007	254926.173
2008	274702.304
2009	259440.25
2010	262982.572
2011	252417.945
2012	252436.28
2013	258710.517
2014	250800.798
2015	253774.735
2016	252344.605