Year	kt
1960	2222014.9450495956
1961	2323411.31275544
1962	2476918.9031692008
1963	2640332.2053810568
1964	2827084.371250475
1965	3040207.761531976
1966	3249073.46977448
1967	3484442.423577562
1968	3779839.7433374347
1969	4092552.46185474
1970	4724942.014472516
1971	4937941.634927302
1972	5341893.3440380385
1973	5660852.31314356
1974	5463852.005622137
1975	5253199.886214046
1976	5484942.384094378
1977	5648735.247108157
1978	5774765.935991184
1979	5786643.713694936
1980	5378013.505134375
1981	4980176.02546336
1982	4749196.77484777
1983	4662768.304852665
1984	4719141.335260471
1985	4618941.409212873
1986	4750814.033916847
1987	4831854.39078896
1988	5021651.294395569
1989	5127462.119254246
1990	4910980.4410078805
1991	4877414.064002762
1992	4986562.615999996
1993	5003731.509999997
1994	5051545.522999995
1995	5078200.945999997
1996	5187987.258999997
1997	5210154.2739999965
1998	5216025.140999997
1999	5255254.706999998
2000	5271275.829999998
2001	5278059.7799999975
2002	5247388.991999996
2003	5323926.6159999985
2004	5361065.992
2005	5352133.179999998
2006	5258173.638999999
2007	5157323.805
2008	5000563.221999999
2009	4806571.587999999
2010	4804774.757999999
2011	4657808.732
2012	4564135.216999998
2013	4547061.664999999
2014	4515969.172
2015	4743889.707573113
2016	4703527.153830098