Year	Tonnes
1933	7.334
1934	7.334
1935	18.335
1936	128.345
1937	297.027
1938	348.365
1939	432.706
1940	693.063
1941	627.057
1942	744.401
1943	462.042
1944	154.014
1945	121.011
1946	484.044
1947	927.751
1948	704.064
1949	1015.759
1950	297.027
1951	403.37
1952	374.034
1953	414.371
1954	502.379
1955	663.727
1956	839.743
1957	1507.137
1958	1202.776
1959	1444.798
1960	2024.184
1961	2280.874
1962	2464.224
1963	2082.856
1964	2016.85
1965	2174.531
1966	2552.232
1967	2680.577
1968	3072.946
1969	3245.295
1970	3744.007
1971	4352.729
1972	5643.513
1973	5291.481
1974	4345.395
1975	4594.751
1976	4950.45
1977	5720.52
1978	6494.257
1979	7587.023
1980	5170.47
1981	7341.334
1982	7308.331
1983	7631.027
1984	7825.378
1985	7880.383
1986	8056.399
1987	7444.01
1988	7326.666
1989	8984.15
1990	5515.168
1991	4286.723
1992	2515.562
1993	2335.879
1994	1925.175
1995	2086.523
1996	2016.85
1997	1543.807
1998	1752.826
1999	2984.938
2000	3021.608
2001	3223.293
2002	3751.341
2003	4294.057
2004	4165.712
2005	4253.72
2006	3898.021
2007	3927.357
2008	4374.731
2009	4378.398
2010	4598.418
2011	5240.143
2012	4910.113
2013	5064.127
2014	5716.853