Year	kt
1960	297.4927561818263
1961	335.8789182698038
1962	405.85369290934625
1963	435.75870186056125
1964	653.6380527908416
1965	584.6203701980197
1966	556.201324424505
1967	633.3387343811883
1968	730.7754627475249
1969	816.0326000680694
1970	941.8883742079208
1971	1047.444829938119
1972	1092.1033304393563
1973	1181.4203314418316
1974	1242.3182866707918
1975	1189.540058805693
1976	950.008101571782
1977	1372.2339244925738
1978	1234.1985593069303
1979	1441.251607085396
1980	1457.4910618131187
1981	1810.6992021410888
1982	1518.3890170420784
1983	1412.832561311881
1984	1262.6176050804454
1985	1360.0543334467818
1986	1364.1141971287125
1987	1274.7971961262372
1988	1429.0720160396038
1989	1526.5087444059404
1990	1640.1849275
1991	1534.49282
1992	1565.8089999999997
1993	1587.8109999999997
1994	1587.8109999999997
1995	1624.4809999999998
1996	1683.1529999999993
1997	1679.4859999999994
1998	1657.4839999999995
1999	1697.8209999999995
2000	1782.1619999999998
2001	2057.187
2002	1877.5039999999997
2003	2046.1859999999997
2004	2376.216000000001
2005	2108.5249999999996
2006	2240.537
2007	2273.5399999999995
2008	1965.512
2009	1939.843
2010	2306.543
2011	2200.2000000000003
2012	2167.197
2013	2460.5570000000002
2014	2841.925000000001
2015	3362.639
2016	3259.962999999999