Year	kt
1960	1130683.060303155
1961	1233950.46538227
1962	1400584.4911998326
1963	1565199.8445618576
1964	1736678.6842727093
1965	1896065.1836157588
1966	2076613.2786024634
1967	2243429.4773001596
1968	2434272.801810104
1969	2642304.3837402435
1970	2951112.033523884
1971	3120252.1673411257
1972	3378425.6036302675
1973	3611562.577879391
1974	3613088.8911994332
1975	3576910.3419231214
1976	3770107.1431007395
1977	3800958.366530975
1978	4014066.171148088
1979	4068225.6760527426
1980	3964008.017842119
1981	3806625.4201805433
1982	3735740.4754430577
1983	3669321.2280645296
1984	3635220.434340016
1985	3605176.6798919966
1986	3639572.8890978084
1987	3453121.408076497
1988	3431930.270884711
1989	3487079.4176517166
1990	3336304.279588509
1991	3350673.8888738393
1992	2713494.1103829746
1993	2602736.3042752147
1994	2402866.1686466406
1995	2394838.364135673
1996	2388012.88057681
1997	2336904.9914897094
1998	2362379.3978779656
1999	2310779.4820627742
2000	2273233.7733154
2001	2326912.77951546
2002	2312200.0705107986
2003	2323942.121901492
2004	2327156.9431549637
2005	2307427.781193219
2006	2316737.7123365197
2007	2256545.2864822573
2008	2276640.0532306004
2009	2173319.331913513
2010	2144583.4284371943
2011	2131950.6478674132
2012	2071526.2956885863
2013	2024913.5387780538
2014	2024410.4309472232
2015	2163011.0032665655
2016	2233132.6596480464