Year	kt
1992	44451.374
1993	36699.336
1994	30509.44
1995	28532.927
1996	26637.088
1997	22889.414
1998	22068.006
1999	19816.468
2000	16699.518
2001	15797.436
2002	14983.362
2003	14620.329
2004	16450.162
2005	16530.836
2006	18518.35
2007	16666.515
2008	18441.343
2009	23325.787
2010	16941.54
2011	20091.493
2012	18881.383
2013	18312.998
2014	18004.97
2015	16772.858
2016	16835.197