Year	Tonnes
1959	47.671
1960	121.011
1961	117.344
1962	139.346
1963	176.016
1964	176.016
1965	198.018
1966	190.684
1967	223.687
1968	198.018
1969	161.348
1970	201.685
1971	227.354
1972	245.689
1973	267.691
1974	304.361
1975	341.031
1976	341.031
1977	414.371
1978	396.036
1979	429.039
1980	392.369
1981	396.036
1982	366.7
1983	418.038
1984	436.373
1985	407.037
1986	381.368
1987	359.366
1988	385.035
1989	418.038
1990	421.705
1991	436.373
1992	443.707
1993	454.708
1994	462.042
1995	469.376
1996	487.711
1997	524.381
1998	762.736
1999	795.739
2000	821.408
2001	828.742
2002	847.077
2003	843.41
2004	876.413
2005	898.415
2006	942.419
2007	1008.425
2008	1070.764
2009	806.74
2010	964.421
2011	1045.095
2012	993.757
2013	1026.76
2014	1411.795