Year	kt
1990	20875.3
1991	20266.6
1992	21033.8
1993	21801.3
1994	22538.1
1995	25649.9
1996	28062.2
1997	27958.9
1998	26970.3
1999	29072.4
2000	28634.2
2001	26537.2
2002	27731
2003	27157.7
2004	31237.1
2005	31291.8
2006	30843.7
2007	33808.4
2008	38292.6
2009	41170.6
2010	44998.5
2011	48427.4
2012	48120.6
2013	49751.9
2014	53167.8
2015	54553.5
2016	56860.3
2017	54274.3
2018	54589.9
2019	56972.2
2020	46578.9