Year	kt
1960	49676.849
1961	45632.148
1962	47069.612
1963	46636.906
1964	51961.39
1965	54220.262
1966	52625.117
1967	57362.881
1968	60626.511
1969	59167.045
1970	58862.684
1971	55921.75
1972	62206.988
1973	52056.732
1974	48547.413
1975	61334.242
1976	59148.71
1977	65085.583
1978	69566.657
1979	76090.25
1980	81238.718
1981	83757.947
1982	88517.713
1983	93600.175
1984	102998.696
1985	99845.076
1986	92562.414
1987	99111.676
1988	106493.347
1989	106984.725
1990	93867.866
1991	98022.577
1992	101689.577
1993	93431.493
1994	96299.087
1995	98392.944
1996	100497.802
1997	106852.713
1998	114018.031
1999	113787.01
2000	122188.107
2001	121198.017
2002	116452.919
2003	114857.774
2004	110604.054
2005	113401.975
2006	115594.841
2007	114505.742
2008	112437.554
2009	88257.356
2010	86970.239
2011	77612.055
2012	75529.199
2013	69137.618
2014	74990.15
2015	70670.424
2016	65862.987