Year	kt
1990	11018.2
1991	10171.7
1992	7686.2
1993	5167.3
1994	3035.37
1995	2508.62
1996	2240.2
1997	2513.44
1998	2765.715
1999	2544.59
2000	2200.97
2001	2150.05
2002	2133.81
2003	2175.1
2004	2597.02
2005	2471.2
2006	2686.5
2007	3267.8
2008	3041.06
2009	2405.15
2010	2446.9
2011	2564.2
2012	3015.2
2013	3195.1
2014	4583.6
2015	4904.8
2016	5496.7
2017	6757.7
2018	8097.3
2019	8965.7
2020	9328.8