Year	kt
1960	3494.651
1961	3578.992
1962	3722.005
1963	4081.371
1964	4239.052
1965	4074.037
1966	4437.07
1967	5020.123
1968	5819.529
1969	6211.898
1970	6772.949
1971	7433.009
1972	8159.075
1973	9039.155
1974	11147.68
1975	11213.686
1976	11690.396
1977	12537.473
1978	15812.104
1979	17308.24
1980	10670.97
1981	8566.112
1982	10344.607
1983	10659.969
1984	10575.628
1985	12904.173
1986	12427.463
1987	11602.388
1988	11063.339
1989	12339.455
1990	15907.446
1991	15522.411
1992	14818.347
1993	18217.656
1994	20263.842
1995	22284.359
1996	25217.959
1997	25595.66
1998	26288.723
1999	26024.699
2000	26721.429
2001	30663.454
2002	34730.157
2003	42493.196
2004	37913.113
2005	46845.925
2006	50329.575
2007	45877.837
2008	40817.377
2009	40846.713
2010	51095.978
2011	56086.765
2012	49262.478
2013	50017.88
2014	48983.786
2015	44150.68
2016	47659.999