Year	kt
1997	396.036
1998	601.388
1999	649.059
2000	792.072
2001	1349.456
2002	1155.105
2003	1279.783
2004	1866.503
2005	2742.916
2006	2266.206
2007	2324.878
2008	2053.52
2009	2090.19
2010	2035.185
2011	2247.871
2012	2200.2
2013	2438.555