Year	kt
1990	28970
1991	30474.9
1992	31410.9
1993	36164.2
1994	37978.8
1995	37581.9
1996	38520.1
1997	38161.6
1998	37047.1
1999	37802.1
2000	42117.5
2001	42031.3
2002	41290.8
2003	38157.7
2004	39618.8
2005	36901.4
2006	37171.6
2007	38286
2008	38423.6
2009	38831.8
2010	42413.6
2011	44766.9
2012	43692.3
2013	43912.3
2014	44398.5
2015	45431.9
2016	44969.8
2017	47324.2
2018	45212.1
2019	45163.2
2020	43705