Year	kt
1960	5944.207
1961	6527.26
1962	7326.666
1963	7631.027
1964	8478.104
1965	12159.772
1966	12812.498
1967	12915.174
1968	12966.512
1969	13872.261
1970	15632.421
1971	15309.725
1972	15929.448
1973	18573.355
1974	18423.008
1975	18437.676
1976	18496.348
1977	18797.042
1978	20065.824
1979	19911.81
1980	19941.146
1981	19893.475
1982	20439.858
1983	18327.666
1984	15496.742
1985	15980.786
1986	16989.211
1987	17528.26
1988	20186.835
1989	21338.273
1990	24843.925
1991	24062.854
1992	27385.156
1993	27638.179
1994	29930.054
1995	30395.763
1996	29350.668
1997	30095.069
1998	29031.639
1999	28279.904
2000	29170.985
2001	30626.784
2002	28232.233
2003	30813.801
2004	24532.23
2005	23560.475
2006	25727.672
2007	25151.953
2008	29229.657
2009	27157.802
2010	28136.891
2011	28023.214
2012	35173.864
2013	22966.421
2014	20293.178
2015	21880.989
2016	22786.738