Year	kt
1990	4083
1991	4015.2
1992	4278.2
1993	4813.6
1994	5647.4
1995	6936.6
1996	7309.6
1997	7247.9
1998	7913
1999	8741
2000	9440.5
2001	8351.8
2002	8341.2
2003	10486.6
2004	10268.2
2005	10856.3
2006	10057.9
2007	10505.5
2008	7943.6
2009	7371.1
2010	8131.3
2011	8692.9
2012	11964
2013	13592.5
2014	17034.8
2015	19034
2016	21860.8
2017	32497
2018	32784.5
2019	33995
2020	33874.6