Year	kt
1960	115836.863
1961	118759.462
1962	126390.489
1963	134380.882
1964	143838.075
1965	151872.472
1966	155953.843
1967	171630.268
1968	179349.303
1969	181677.848
1970	211545.563
1971	220507.711
1972	233510.893
1973	238369.668
1974	249128.646
1975	242183.348
1976	233925.264
1977	233892.261
1978	234016.939
1979	244493.558
1980	241493.952
1981	228094.734
1982	208813.648
1983	193969.632
1984	192664.18
1985	186811.648
1986	186580.627
1987	202029.698
1988	211054.185
1989	206811.466
1990	205729.701
1991	192418.491
1992	197761.31
1993	202385.397
1994	201857.349
1995	205616.024
1996	207313.845
1997	215179.56
1998	224325.058
1999	227731.701
2000	231197.016
2001	231684.727
2002	224064.701
2003	244863.925
2004	253375.032
2005	252520.621
2006	263462.949
2007	265058.094
2008	258057.791
2009	255776.917
2010	250892.473
2011	244830.922
2012	241970.662
2013	242084.339
2014	253327.361
2015	269326.482
2016	252538.956