Year	kt
1960	9508.531
1961	10120.92
1962	10700.306
1963	11569.385
1964	12728.157
1965	13483.559
1966	14337.97
1967	15705.761
1968	16211.807
1969	16688.517
1970	18800.709
1971	19585.447
1972	19798.133
1973	23637.482
1974	24323.211
1975	23648.483
1976	22321.029
1977	25126.284
1978	25977.028
1979	30062.066
1980	32929.66
1981	31649.877
1982	32977.331
1983	34260.781
1984	37663.757
1985	36607.661
1986	41048.398
1987	41004.394
1988	42797.557
1989	39079.219
1990	42379.519
1991	43112.919
1992	19354.426
1993	39867.624
1994	50080.219
1995	57212.534
1996	64172.5
1997	65719.974
1998	80343.97
1999	77861.411
2000	53409.855
2001	60919.871
2002	55756.735
2003	51866.048
2004	51143.649
2005	52078.734
2006	56809.164
2007	58055.944
2008	55936.418
2009	54319.271
2010	59233.051
2011	47916.689
2012	49783.192
2013	48551.08
2014	46684.577
2015	46471.891
2016	48796.769