Year	kt
1960	2365.215
1961	2742.916
1962	2610.904
1963	2944.601
1964	3190.29
1965	3193.957
1966	3245.295
1967	2841.925
1968	2588.902
1969	2731.915
1970	3010.607
1971	2343.213
1972	1642.816
1973	2148.862
1974	1785.829
1975	1639.149
1976	1316.453
1977	1254.114
1978	1690.487
1979	1683.153
1980	1628.148
1981	1426.463
1982	1210.11
1983	1606.146
1984	1591.478
1985	2867.594
1986	5471.164
1987	6956.299
1988	7920.72
1989	9570.87
1990	10355.608
1991	11056.005
1992	11210.019
1993	12020.426
1994	12669.485
1995	13538.564
1996	12977.513
1997	13281.874
1998	11785.738
1999	14389.308
2000	14363.639
2001	12185.441
2002	13182.865
2003	12449.465
2004	12885.838
2005	12772.161
2006	12438.464
2007	10942.328
2008	9710.216
2009	10751.644
2010	6303.573
2011	8379.095
2012	11133.012
2013	10051.247
2014	10164.924
2015	12357.79
2016	10795.648