Year	kt
1990	40.337
1991	40.337
1992	33.003
1993	238.355
1994	264.024
1995	44.004
1996	36.67
1997	29.336
1998	29.336
1999	14.668
2000	7.334
2001	11.001
2002	3.667
2003	22.002
2004	3.667
2005	51.338
2006	168.682
2007	157.681
2008	850.744
2009	396.036
2010	278.692
2011	69.673
2012	275.025
2013	106.343
2014	69.673
2015	77.007
2016	139.346