Year	Tonnes
1932	77.007
1933	66.006
1934	51.338
1935	51.338
1936	55.005
1937	73.34
1938	77.007
1939	88.008
1940	84.341
1941	88.008
1942	73.34
1943	66.006
1944	95.342
1945	110.01
1946	143.013
1947	146.68
1948	146.68
1949	146.68
1950	2456.89
1951	2625.572
1952	3157.287
1953	3509.319
1954	3740.34
1955	3923.69
1956	4026.366
1957	4437.07
1958	3982.362
1959	4393.066
1960	4319.726
1961	4121.708
1962	4011.698
1963	4319.726
1964	4558.081
1965	5522.502
1966	5405.158
1967	4884.444
1968	4884.444
1969	5595.842
1970	5742.522
1971	5808.528
1972	6076.219
1973	5775.525
1974	5683.85
1975	5969.876
1976	5896.536
1977	5650.847
1978	5742.522
1979	6277.904
1980	5837.864
1981	5375.822
1982	4873.443
1983	3817.347
1984	3450.647
1985	3296.633
1986	3179.289
1987	3560.657
1988	4807.437
1989	4880.777
1990	3993.363
1991	4554.414
1992	5170.47
1993	4466.406
1994	4066.703
1995	4591.084
1996	5441.828
1997	5555.505
1998	5687.517
1999	6725.278
2000	5306.149
2001	5089.796
2002	4620.42
2003	4598.418
2004	5610.51
2005	5775.525
2006	6648.271
2007	6002.879
2008	8265.418
2009	8060.066
2010	6387.914
2011	7763.039
2012	8694.457
2013	7587.023
2014	6747.28