Year	kt
1992	22101.009
1993	24418.553
1994	20403.188
1995	19119.738
1996	18624.693
1997	19174.743
1998	18954.723
1999	19750.462
2000	19695.457
2001	19475.437
2002	19163.742
2003	20469.194
2004	19083.068
2005	14741.34
2006	14682.668
2007	13314.877
2008	13025.184
2009	12203.776
2010	10315.271
2011	9713.883
2012	8624.784
2013	8126.072
2014	7649.362
2015	7440.343
2016	6560.263