Year	kt
1960	5463.83
1961	5621.511
1962	5907.537
1963	6739.946
1964	6952.632
1965	9042.822
1966	10549.959
1967	11496.045
1968	13626.572
1969	15060.369
1970	16043.125
1971	18357.002
1972	21470.285
1973	25518.653
1974	23721.823
1975	23553.141
1976	25137.285
1977	27920.538
1978	30520.441
1979	31704.882
1980	32265.933
1981	29981.392
1982	29952.056
1983	29123.314
1984	29512.016
1985	29853.047
1986	27905.87
1987	30117.071
1988	32097.251
1989	36182.289
1990	35434.221
1991	37286.056
1992	37795.769
1993	37044.034
1994	38155.135
1995	38448.495
1996	41554.444
1997	42196.169
1998	43479.619
1999	43200.927
2000	44411.037
2001	45918.174
2002	47021.941
2003	48664.757
2004	48661.09
2005	50421.25
2006	49885.868
2007	47340.97
2008	48756.432
2009	46823.923
2010	40813.71
2011	36838.682
2012	37040.367
2013	31510.531
2014	32650.968
2015	34161.772
2016	34708.155