Year	Tonnes
1930	0
1931	0
1932	0
1933	3.667
1934	44.004
1935	25.669
1936	77.007
1937	205.352
1938	216.353
1939	2629.239
1940	2962.936
1941	1969.179
1942	1246.78
1943	1873.837
1944	2497.227
1945	920.417
1946	946.086
1947	5357.487
1948	80.674
1949	11477.71
1950	414.371
1951	300.694
1952	322.696
1953	344.698
1954	359.366
1955	300.694
1956	297.027
1957	293.36
1958	319.029
1959	326.363
1960	333.697
1961	304.361
1962	370.367
1963	355.699
1964	341.031
1965	333.697
1966	491.378
1967	440.04
1968	429.039
1969	487.711
1970	8210.413
1971	7517.35
1972	9460.86
1973	9981.574
1974	8184.744
1975	7080.977
1976	6024.881
1977	6395.248
1978	9541.534
1979	7440.343
1980	6882.959
1981	1470.467
1982	2093.857
1983	2706.246
1984	1917.841
1985	2596.236
1986	2299.209
1987	3318.635
1988	5716.853
1989	6347.577
1990	6193.563
1991	5309.816
1992	5214.474
1993	4968.785
1994	4693.76
1995	4789.102
1996	4869.776
1997	5060.46
1998	5269.479
1999	3909.022
2000	4712.095
2001	4506.743
2002	4378.398
2003	4591.084
2004	4998.121
2005	5005.455
2006	4862.442
2007	8415.765
2008	9119.829
2009	7862.048
2010	8203.079
2011	9695.548
2012	9666.212
2013	7803.376
2014	9108.828