Year	kt
1960	6930.63
1961	7223.99
1962	8338.758
1963	9101.494
1964	9816.559
1965	10190.593
1966	11441.04
1967	11496.045
1968	12845.501
1969	13344.213
1970	14411.31
1971	15295.057
1972	16299.815
1973	15434.403
1974	14836.682
1975	12889.505
1976	13762.251
1977	14095.948
1978	14557.99
1979	15434.403
1980	15456.405
1981	15764.433
1982	14114.283
1983	13611.904
1984	13699.912
1985	13256.205
1986	14132.618
1987	14627.663
1988	16314.483
1989	17935.297
1990	18540.352
1991	19130.739
1992	20835.894
1993	22838.076
1994	24253.538
1995	26857.108
1996	29280.995
1997	31077.825
1998	31235.506
1999	32181.592
2000	30652.453
2001	28488.923
2002	30348.092
2003	29611.025
2004	31349.183
2005	33853.744
2006	35764.251
2007	47263.963
2008	47590.326
2009	44968.421
2010	43494.287
2011	45665.151
2012	45199.442
2013	45951.177
2014	43853.653
2015	44389.035
2016	46101.524