Year	kt
1960	7759.372
1961	8030.73
1962	9655.211
1963	10810.316
1964	12090.099
1965	13065.521
1966	15185.047
1967	17073.552
1968	20883.565
1969	21312.604
1970	23476.134
1971	25955.026
1972	24917.265
1973	29457.011
1974	28672.273
1975	30249.083
1976	32713.307
1977	33938.085
1978	34433.13
1979	35067.521
1980	33417.371
1981	31327.181
1982	31217.171
1983	31030.154
1984	25606.661
1985	22871.079
1986	24506.561
1987	27568.506
1988	31745.219
1989	34004.091
1990	34983.18
1991	36350.971
1992	41195.078
1993	41316.089
1994	45830.166
1995	50740.279
1996	50039.882
1997	57029.184
1998	55929.084
1999	51000.636
2000	51007.97
2001	50094.887
2002	47076.946
2003	45060.096
2004	46537.897
2005	42009.152
2006	38683.183
2007	36670
2008	39258.902
2009	38686.85
2010	41631.451
2011	39013.213
2012	41466.436
2013	41426.099
2014	44037.003
2015	52001.727
2016	56189.441