Year	kt
1992	31250.174
1993	30843.137
1994	25052.944
1995	19900.809
1996	19383.762
1997	18566.021
1998	20967.906
1999	16791.193
2000	17979.301
2001	11287.026
2002	11294.36
2003	12706.155
2004	12742.825
2005	14649.665
2006	12988.514
2007	11466.709
2008	10615.965
2009	9248.174
2010	8701.791
2011	10271.267
2012	11650.059
2013	11921.417
2014	11499.712
2015	11609.722
2016	12244.113