Year	kt
1992	17352.244
1993	8797.133
1994	8819.135
1995	8118.738
1996	9427.857
1997	9215.171
1998	11818.741
1999	12915.174
2000	12346.789
2001	11734.4
2002	13252.538
2003	14979.695
2004	15357.396
2005	15372.064
2006	15009.031
2007	15691.093
2008	16215.474
2009	15265.721
2010	17000.212
2011	17766.615
2012	18591.69
2013	19108.737
2014	19996.151
2015	20128.163
2016	19985.15