Year	Tonnes
1933	11.001
1934	121.011
1935	531.715
1936	1950.844
1937	3256.296
1938	3479.983
1939	3186.623
1940	2970.27
1941	2852.926
1942	2618.238
1943	2761.251
1944	2819.923
1945	3065.612
1946	3362.639
1947	3953.026
1948	4580.083
1949	4613.086
1950	1382.459
1951	1177.107
1952	1287.117
1953	997.424
1954	1045.095
1955	1404.461
1956	1056.096
1957	755.402
1958	1290.784
1959	1312.786
1960	575.719
1961	1771.161
1962	1591.478
1963	1195.442
1964	1598.812
1965	1228.445
1966	649.059
1967	1004.758
1968	1103.767
1969	1272.449
1970	2592.569
1971	3039.943
1972	3681.668
1973	5522.502
1974	5405.158
1975	5753.523
1976	6574.931
1977	7469.679
1978	7766.706
1979	8133.406
1980	7887.717
1981	8525.775
1982	9838.561
1983	8228.748
1984	9207.837
1985	10194.26
1986	11012.001
1987	11430.039
1988	12163.439
1989	11738.067
1990	12427.463
1991	11877.413
1992	10901.991
1993	14642.331
1994	14789.011
1995	14818.347
1996	15621.42
1997	17319.241
1998	18404.673
1999	18019.638
2000	18643.028
2001	13927.266
2002	15698.427
2003	16468.497
2004	17509.925
2005	19207.746
2006	18830.045
2007	26846.107
2008	29768.706
2009	28217.565
2010	29266.327
2011	28650.271
2012	26673.758
2013	31312.513
2014	31338.182