Year	Tonnes
1936	22.002
1937	18.335
1940	33.003
1941	25.669
1943	18.335
1944	18.335
1945	14.668
1946	11.001
1947	3.667
1948	3.667
1949	3.667
1950	740.734
1951	645.392
1952	777.404
1953	916.75
1954	781.071
1955	913.083
1956	949.753
1957	964.421
1958	1092.766
1959	1239.446
1960	1213.777
1961	1092.766
1962	1199.109
1963	1305.452
1964	1309.119
1965	1397.127
1966	1496.136
1967	1444.798
1968	1595.145
1969	1265.115
1970	1389.793
1971	1474.134
1972	1485.135
1973	1752.826
1974	1741.825
1975	1617.147
1976	1705.155
1977	1906.84
1978	1925.175
1979	1987.514
1980	1866.503
1981	1752.826
1982	1598.812
1983	1547.474
1984	1815.165
1985	1628.148
1986	1785.829
1987	1851.835
1988	1848.168
1989	1903.173
1990	1998.515
1991	1767.494
1992	1818.832
1993	1976.513
1994	2009.516
1995	1947.177
1996	2211.201
1997	2104.858
1998	2101.191
1999	2068.188
2000	2163.53
2001	2101.191
2002	2170.864
2003	2167.197
2004	2244.204
2005	2229.536
2006	2299.209
2007	2310.21
2008	2119.526
2009	2053.52
2010	1961.845
2011	1881.171
2012	1800.497
2013	1899.506
2014	1983.847