Year	kt
1992	23813.498
1993	23707.155
1994	20967.906
1995	20894.566
1996	20366.518
1997	19431.433
1998	18092.978
1999	17564.93
2000	16307.149
2001	16967.209
2002	16409.825
2003	17638.27
2004	17308.24
2005	16332.818
2006	17396.248
2007	15423.402
2008	15573.749
2009	15005.364
2010	15196.048
2011	14374.64
2012	13457.89
2013	13410.219
2014	13289.208
2015	12753.826
2016	13164.53