Year	kt
1990	32388.1
1991	35766
1992	35151.5
1993	35882.4
1994	37441.8
1995	38978.7
1996	42022.9
1997	42072.7
1998	44630.8
1999	43872.2
2000	44401.1
2001	44728.9
2002	44267.3
2003	44378.7
2004	46364.3
2005	57220.3
2006	60213.9
2007	63604.5
2008	65275.9
2009	60696.7
2010	61090.7
2011	57562.5
2012	45039.2
2013	30696.6
2014	26603.9
2015	25260.7
2016	24479.1
2017	25794.4
2018	28303.1
2019	26840.4
2020	25234.6