Year	Tonnes
1924	0
1925	0
1926	0
1927	139.346
1928	289.693
1929	370.367
1930	370.367
1931	366.7
1932	374.034
1933	352.032
1934	2867.594
1935	5727.854
1936	5797.527
1937	6248.568
1938	5922.205
1939	12167.106
1940	7697.033
1941	4811.104
1942	7968.391
1943	10967.997
1944	12783.162
1945	14143.619
1946	14367.306
1947	14436.979
1948	0
1949	1129.436
1950	1650.15
1951	2431.221
1952	1961.845
1953	2530.23
1954	3050.944
1955	4103.373
1956	6402.582
1957	5977.21
1958	6673.94
1959	7322.999
1960	8265.418
1961	8720.126
1962	9031.821
1963	9394.854
1964	9075.825
1965	19314.089
1966	27704.185
1967	18393.672
1968	19717.459
1969	22625.39
1970	23908.84
1971	28862.957
1972	29552.353
1973	30645.119
1974	30942.146
1975	33157.014
1976	48800.436
1977	43710.64
1978	42317.18
1979	52991.817
1980	45558.808
1981	32122.92
1982	30623.117
1983	38749.189
1984	40204.988
1985	44675.061
1986	47751.674
1987	52881.807
1988	67927.508
1989	73251.992
1990	47693.002
1991	45643.149
1992	59112.04
1993	63362.093
1994	71334.151
1995	74348.425
1996	69500.651
1997	68308.876
1998	72371.912
1999	72283.904
2000	72445.252
2001	85342.091
2002	87259.932
2003	91117.616
2004	114084.037
2005	113522.986
2006	98770.645
2007	62155.65
2008	93149.134
2009	104546.17
2010	112195.532
2011	134384.549
2012	152723.216
2013	165506.378
2014	168443.645