Year	Tonnes
1941	77.007
1942	84.341
1943	84.341
1944	88.008
1945	110.01
1946	168.682
1947	190.684
1948	183.35
1949	183.35
1950	5610.51
1951	6475.922
1952	6288.905
1953	6197.23
1954	5955.208
1955	6783.95
1956	5848.865
1957	13879.595
1958	18012.304
1959	15680.092
1960	13699.912
1961	12181.774
1962	14169.288
1963	13039.852
1964	14293.966
1965	14609.328
1966	15185.047
1967	15749.765
1968	16035.791
1969	17260.569
1970	18672.364
1971	19607.449
1972	20799.224
1973	22398.036
1974	22911.416
1975	27066.127
1976	27223.808
1977	29402.006
1978	30689.123
1979	31712.216
1980	31400.521
1981	32749.977
1982	34554.141
1983	30843.137
1984	32603.297
1985	32577.628
1986	33567.718
1987	33952.753
1988	35635.906
1989	35738.582
1990	33344.031
1991	29710.034
1992	31294.178
1993	29380.004
1994	32247.598
1995	25709.337
1996	26996.454
1997	24649.574
1998	24499.227
1999	25331.636
2000	26083.371
2001	25452.647
2002	26090.705
2003	25485.65
2004	25005.273
2005	26006.364
2006	27407.158
2007	26794.769
2008	30443.434
2009	29897.051
2010	38375.155
2011	35987.938
2012	36156.62
2013	34799.83
2014	34836.5