Year	kt
1990	171403.3
1991	187924.9
1992	202031.7
1993	203252.6
1994	206359.4
1995	204830.5
1996	217652.4
1997	220072.7
1998	233898.8
1999	239520.5
2000	249654.8
2001	254084.2
2002	272251.2
2003	284828.3
2004	299889.4
2005	315293.2
2006	335434.3
2007	354617.4
2008	389713.4
2009	406526.7
2010	446131.5
2011	463763.7
2012	492467.1
2013	503213.7
2014	540520.2
2015	565190.1
2016	561229.7
2017	549749.9
2018	527565.7
2019	526770.3
2020	513555.8