Year	kt
1972	22.002
1973	51.338
1974	88.008
1975	187.017
1976	594.054
1977	781.071
1978	832.409
1979	942.419
1980	986.423
1981	1008.425
1982	1100.1
1983	1030.427
1984	1045.095
1985	1158.772
1986	1067.097
1987	1239.446
1988	1301.785
1989	1430.13
1990	1749.159
1991	1719.823
1992	1947.177
1993	1925.175
1994	1954.511
1995	1976.513
1996	1587.811
1997	1701.488
1998	2024.184
1999	1595.145
2000	2053.52
2001	2005.849
2002	2090.19
2003	1804.164
2004	1983.847
2005	2141.528
2006	2093.857
2007	1936.176
2008	1954.511
2009	1576.81
2010	1991.181
2011	1430.13
2012	2328.545
2013	2775.919
2014	3846.683
2015	2900.597
2016	3575.325