Year	kt
1990	53483.7
1991	52059.4
1992	63613.2
1993	48052
1994	33515.3
1995	32474.9
1996	27193.3
1997	26489.6
1998	26490.5
1999	26122.2
2000	27687.2
2001	26397.2
2002	26177.6
2003	28569.4
2004	28311.9
2005	30043.4
2006	30488.4
2007	27627.7
2008	30447.6
2009	25495.8
2010	24311.9
2011	27282.1
2012	30110.6
2013	30939.6
2014	32243.4
2015	31773.3
2016	32239.4
2017	31957
2018	32728.1
2019	35521
2020	34305