Year	kt
1960	15203.382
1961	15969.785
1962	18632.027
1963	19966.815
1964	20971.573
1965	22306.361
1966	24275.54
1967	26468.406
1968	29915.386
1969	33949.086
1970	32742.643
1971	33010.334
1972	35452.556
1973	39970.3
1974	41792.799
1975	44026.002
1976	43871.988
1977	44748.401
1978	50234.233
1979	54044.246
1980	53545.534
1981	58730.672
1982	56607.479
1983	66361.699
1984	66790.738
1985	70861.108
1986	71147.134
1987	75375.185
1988	81968.451
1989	83640.603
1990	47876.352
1991	38411.825
1992	41913.81
1993	36695.669
1994	38078.128
1995	38628.178
1996	37953.45
1997	34077.431
1998	27924.205
1999	26761.766
2000	29167.318
2001	31638.876
2002	32779.313
2003	34495.469
2004	34693.487
2005	34792.496
2006	38074.461
2007	39698.942
2008	36670
2009	29699.033
2010	27462.163
2011	32236.597
2012	29853.047
2013	22563.051
2014	22464.042
2015	23362.457
2016	20773.555