Year	Tonnes
1927	44.004
1928	22.002
1929	11.001
1930	11.001
1931	11.001
1932	62.339
1933	51.338
1934	66.006
1935	47.671
1936	51.338
1937	58.672
1938	40.337
1939	66.006
1940	66.006
1941	58.672
1942	29.336
1943	51.338
1944	55.005
1945	47.671
1946	55.005
1947	58.672
1948	44.004
1949	58.672
1950	902.082
1951	931.418
1952	1074.431
1953	1081.765
1954	1144.104
1955	1375.125
1956	1554.808
1957	1771.161
1958	1818.832
1959	1796.83
1960	1884.838
1961	2632.906
1962	1987.514
1963	1661.151
1964	2141.528
1965	2005.849
1966	2126.86
1967	1873.837
1968	2779.586
1969	3241.628
1970	2984.938
1971	3615.662
1972	3300.3
1973	3564.324
1974	3149.953
1975	2885.929
1976	2559.566
1977	2713.58
1978	2874.928
1979	2643.907
1980	3208.625
1981	2489.893
1982	2541.231
1983	1976.513
1984	1536.473
1985	1147.771
1986	982.756
1987	982.756
1988	1012.092
1989	1041.428
1990	1023.093
1991	1023.093
1992	1004.758
1993	1078.098
1994	1063.43
1995	1114.768
1996	1041.428
1997	1125.769
1998	1133.103
1999	1188.108
2000	1349.456
2001	1580.477
2002	1587.811
2003	1917.841
2004	1921.508
2005	1822.499
2006	1980.18
2007	2262.539
2008	2266.206
2009	2530.23
2010	2735.582
2011	3223.293
2012	3120.617
2013	4019.032
2014	8426.766