Year	kt
1960	1994.848
1961	2819.923
1962	2324.878
1963	1958.178
1964	2031.518
1965	2112.192
1966	2570.567
1967	2801.588
1968	2687.911
1969	3762.342
1970	5507.834
1971	7179.986
1972	9288.511
1973	11477.71
1974	14451.647
1975	16985.544
1976	19383.762
1977	23256.114
1978	26307.058
1979	27799.527
1980	27341.152
1981	24407.552
1982	22918.75
1983	23457.799
1984	24246.204
1985	24840.258
1986	26373.064
1987	26622.42
1988	27333.818
1989	28844.622
1990	29324.999
1991	30802.8
1992	30263.751
1993	35756.917
1994	41602.115
1995	42471.194
1996	44506.379
1997	44194.684
1998	50542.261
1999	54616.298
2000	59845.44
2001	67212.443
2002	54036.912
2003	60795.193
2004	71579.84
2005	85026.729
2006	103838.439
2007	135433.311
2008	149796.95
2009	171916.294
2010	199748.824
2011	246191.379
2012	277826.588
2013	320389.457
2014	353880.168
2015	366949.356
2016	403091.308