Year	kt
1960	31125.496
1961	33725.399
1962	39093.887
1963	45511.137
1964	55734.733
1965	60725.52
1966	63864.472
1967	65019.577
1968	67458.132
1969	71480.831
1970	85741.794
1971	79881.928
1972	86178.167
1973	87927.326
1974	77183.016
1975	70648.422
1976	83651.604
1977	78334.454
1978	79434.554
1979	89647.149
1980	83717.61
1981	66966.754
1982	57146.528
1983	49636.512
1984	47524.32
1985	46996.272
1986	52892.808
1987	56127.102
1988	53952.571
1989	53585.871
1990	61029.881
1991	60802.527
1992	61231.566
1993	63538.109
1994	63083.401
1995	64630.875
1996	64300.845
1997	65353.274
1998	66222.353
1999	67505.803
2000	66303.027
2001	68591.235
2002	69695.002
2003	69728.005
2004	70938.115
2005	71689.85
2006	73218.989
2007	73017.304
2008	69849.016
2009	66640.391
2010	67139.103
2011	66794.405
2012	63846.137
2013	66416.704
2014	67568.142
2015	65103.918
2016	62936.721