Year	kt
1990	69.6
1991	72.6
1992	901.9
1993	974.5
1994	1050.5
1995	1117
1996	1224.9
1997	1687.9
1998	2051.9
1999	3307
2000	1982.3
2001	2892.6
2002	2543.5
2003	2795.3
2004	5517.6
2005	5609.9
2006	5584.4
2007	6326.2
2008	5816.1
2009	6066.1
2010	6047.8
2011	6089.1
2012	5868.9
2013	5990
2014	5946.6
2015	5494.2
2016	5830.1
2017	5369.3
2018	5068.5
2019	4876.5
2020	4350.4