Year	Tonnes
1928	3.667
1929	3.667
1930	7.334
1931	3.667
1932	3.667
1933	3.667
1934	3.667
1935	0
1936	0
1937	0
1938	0
1939	3.667
1940	0
1941	0
1942	0
1943	0
1944	0
1945	0
1946	0
1947	3.667
1948	3.667
1949	3.667
1950	73.34
1951	110.01
1952	88.008
1953	110.01
1954	113.677
1955	128.345
1956	128.345
1957	135.679
1958	150.347
1959	150.347
1960	172.349
1961	194.351
1962	260.357
1963	190.684
1964	179.683
1965	205.352
1966	267.691
1967	337.364
1968	440.04
1969	480.377
1970	429.039
1971	484.044
1972	502.379
1973	480.377
1974	491.378
1975	568.385
1976	531.715
1977	590.387
1978	630.724
1979	601.388
1980	674.728
1981	685.729
1982	645.392
1983	685.729
1984	748.068
1985	847.077
1986	916.75
1987	942.419
1988	946.086
1989	990.09
1990	1074.431
1991	1206.443
1992	979.089
1993	1114.768
1994	748.068
1995	828.742
1996	850.744
1997	902.082
1998	1140.437
1999	1210.11
2000	1188.108
2001	1221.111
2002	1228.445
2003	1268.782
2004	1294.451
2005	1353.123
2006	1371.458
2007	1364.124
2008	1620.814
2009	1617.147
2010	1477.801
2011	1529.139
2012	1470.467
2013	1448.465
2014	1272.449