Year	kt
1960	39049.883
1961	41503.106
1962	44865.745
1963	46948.601
1964	47040.276
1965	45800.83
1966	51899.051
1967	53769.221
1968	64033.154
1969	69478.649
1970	78316.119
1971	87124.253
1972	97806.224
1973	115459.162
1974	124938.357
1975	129811.8
1976	132316.361
1977	135403.975
1978	145590.901
1979	154655.725
1980	150335.999
1981	135638.663
1982	133302.784
1983	125840.439
1984	122162.438
1985	127618.934
1986	142492.286
1987	145660.574
1988	147772.766
1989	151703.79
1990	150592.689
1991	155176.439
1992	159573.172
1993	167174.863
1994	176287.358
1995	188043.76
1996	206719.791
1997	218666.877
1998	229066.489
1999	233037.85
2000	234046.275
2001	238820.709
2002	231516.045
2003	219594.628
2004	226484.921
2005	232099.098
2006	230844.984
2007	240217.836
2008	253000.998
2009	251145.496
2010	273884.563
2011	289139.283
2012	309527.803
2013	325988.966
2014	342754.49
2015	317125.827
2016	296990.33