Year	Tonnes
1941	11.001
1942	11.001
1943	11.001
1944	11.001
1945	14.668
1946	14.668
1947	14.668
1948	14.668
1949	18.335
1950	619.723
1951	638.058
1952	645.392
1953	682.062
1954	744.401
1955	916.75
1956	979.089
1957	986.423
1958	1129.436
1959	1239.446
1960	1345.789
1961	1408.128
1962	1382.459
1963	1521.805
1964	1771.161
1965	1976.513
1966	1741.825
1967	1983.847
1968	2141.528
1969	2280.874
1970	2299.209
1971	2442.222
1972	2709.913
1973	2937.267
1974	3069.279
1975	3523.987
1976	3311.301
1977	3813.68
1978	4129.042
1979	4693.76
1980	4510.41
1981	3967.694
1982	3626.663
1983	3179.289
1984	3421.311
1985	3523.987
1986	3700.003
1987	3993.363
1988	4125.375
1989	4246.386
1990	5086.129
1991	5053.126
1992	6017.547
1993	5658.181
1994	6838.955
1995	7165.318
1996	6651.938
1997	7598.024
1998	8753.129
1999	8929.145
2000	9915.568
2001	10626.966
2002	11096.342
2003	10828.651
2004	11620.723
2005	12570.476
2006	12647.483
2007	12625.481
2008	11430.039
2009	11851.744
2010	11664.727
2011	11837.076
2012	11972.755
2013	13633.906
2014	18327.666