Year	kt
1960	43002.909
1961	45008.758
1962	42262.175
1963	42812.225
1964	46490.226
1965	47337.303
1966	50344.243
1967	56655.15
1968	59460.405
1969	66959.42
1970	73468.345
1971	85004.727
1972	89966.178
1973	99130.011
1974	103413.067
1975	111260.447
1976	129514.773
1977	140075.733
1978	155697.153
1979	166602.811
1980	195957.146
1981	207772.22
1982	215751.612
1983	195843.469
1984	198069.338
1985	204387.579
1986	219737.641
1987	231032.001
1988	232531.804
1989	247878.199
1990	235832.104
1991	246734.095
1992	248923.294
1993	250001.392
1994	258263.143
1995	237438.25
1996	237038.547
1997	252410.611
1998	264493.376
1999	271625.691
2000	264090.006
2001	275802.404
2002	265578.808
2003	273418.854
2004	276964.843
2005	291361.485
2006	284922.233
2007	286884.078
2008	288633.237
2009	272964.146
2010	259891.291
2011	272733.125
2012	290393.397
2013	277921.93
2014	269495.164
2015	259088.218
2016	252597.628