Year	kt
1960	385.035
1961	374.034
1962	399.703
1963	407.037
1964	454.708
1965	561.051
1966	674.728
1967	740.734
1968	905.749
1969	1089.099
1970	1349.456
1971	1338.455
1972	1298.118
1973	1111.101
1974	1118.435
1975	1085.432
1976	946.086
1977	766.403
1978	660.06
1979	649.059
1980	623.39
1981	524.381
1982	539.049
1983	605.055
1984	572.052
1985	608.722
1986	696.73
1987	766.403
1988	858.078
1989	795.739
1990	751.735
1991	762.736
1992	781.071
1993	781.071
1994	696.73
1995	898.415
1996	938.752
1997	971.755
1998	1111.101
1999	1151.438
2000	1254.114
2001	1294.451
2002	1305.452
2003	1375.125
2004	1459.466
2005	1855.502
2006	2222.202
2007	2566.9
2008	2596.236
2009	2801.588
2010	3248.962
2011	3432.312
2012	3201.291
2013	3399.309
2014	3707.337
2015	4176.713
2016	4437.07