Year	kt
1960	89350.122
1961	116016.546
1962	144355.122
1963	176918.082
1964	215278.569
1965	249337.665
1966	276557.806
1967	302824.527
1968	328291.842
1969	351349.938
1970	325475.586
1971	368350.15
1972	387455.22
1973	409655.238
1974	434352.483
1975	474121.098
1976	521619.749
1977	559635.538
1978	587226.046
1979	625300.507
1980	652748.002
1981	700899.379
1982	742255.805
1983	797653.174
1984	864487.916
1985	949268.956
1986	916981.021
1987	1056877.071
1988	1129109.637
1989	1134192.099
1990	1167341.779
1991	1173693.023
1992	834356.177
1993	815394.12
1994	750484.553
1995	725196.921
1996	729054.605
1997	713587.199
1998	712208.407
1999	720451.823
2000	730631.415
2001	745061.06
2002	745860.466
2003	784668.327
2004	793967.839
2005	800858.132
2006	821558.347
2007	838408.212
2008	838892.256
2009	802519.283
2010	878440.851
2011	906948.109
2012	886629.262
2013	884495.068
2014	882731.241
2015	834257.168
2016	850380.967