Year	kt
1987	55135.02497184951
1988	58252.05028433801
1989	56762.31461882748
1990	61874.81656182953
1991	57948.5157950188
1992	59681.19566928847
1993	53697.95600211767
1994	55598.76860396255
1995	43508.08844620496
1996	45765.30341089575
1997	43027.48525994306
1998	40986.29211246621
1999	44045.77884037524
2000	47208.15096267413
2001	46043.92149984149
2002	48783.92200306622
2003	50255.54972835963
2004	55945.2631165463
2005	56848.733673460636
2006	59220.34388536077
2007	69481.18806745924
2008	62724.95279239182
2009	61685.0765878851
2010	66900.23922886408
2011	72177.09169180188
2012	67520.96258600423
2013	72990.14164733206
2014	86982.164137851
2015	100402.83513830956
2016	118735.46229699712