Year	kt
1960	21956.251334481454
1961	26370.776779470834
1962	32573.61174127929
1963	34342.52527635412
1964	39300.13821018227
1965	43912.50266896291
1966	47636.531163857275
1967	52788.103915127824
1968	54607.44700273769
1969	55212.214980334385
1970	62756.30782907266
1971	64268.227773064405
1972	68377.54864647787
1973	76720.24536306821
1974	79453.33141566867
1975	80271.31887254627
1976	79720.82494422107
1977	85993.35435288426
1978	96483.75273350389
1979	112114.67892369545
1980	122155.37803892269
1981	125628.9171922986
1982	136763.97855755663
1983	143422.5359628867
1984	149670.2627017645
1985	153822.17037254747
1986	152775.4709597451
1987	160843.80689628856
1988	169659.71308523385
1989	212883.2179896453
1990	180791.92503032563
1991	188221.14650238052
1992	165786.29208833352
1993	179939.7724110075
1994	196603.22953967296
1995	214800.56138311105
1996	238486.53077915686
1997	254003.45529273982
1998	280811.4430290131
1999	288438.6501599767
2000	289097.50443450105
2001	301518.84531597374
2002	313529.06242930394
2003	331321.54605863563
2004	361472.6346089591
2005	369948.5179825488
2006	398966.136049777
2007	398347.1760590082
2008	409898.5168867302
2009	408884.9699018464
2010	441883.27440970624
2011	439879.444067637
2012	462877.07222130813
2013	475035.44821575534
2014	487333.0865505779
2015	498296.1274568024
2016	495007.98886460386