Year	kt
1991	1117.9
1992	1218.1
1993	1414.6
1994	1636.2
1995	1773.4
1996	1923.7
1997	1973.5
1998	2017.6
1999	1979
2000	1942.3
2001	2459.7
2002	2131.6
2003	2268.8
2004	2376.7
2005	2525.5
2006	2491.3
2007	2546.9
2008	2929.9
2009	3000.1
2010	3103.5
2011	3303.8
2012	3507.4
2013	3762.4
2014	3932.1
2015	4137.3
2016	4152
2017	4224
2018	4279.3
2019	4316.3
2020	3952.8