Year	Tonnes
1950	271.358
1951	520.714
1952	564.718
1953	616.056
1954	792.072
1955	986.423
1956	1261.448
1957	1606.146
1958	1356.79
1959	1840.834
1960	1470.467
1961	2130.527
1962	2119.526
1963	2398.218
1964	4066.703
1965	2992.272
1966	3520.32
1967	3868.685
1968	3883.353
1969	4272.055
1970	4994.454
1971	5753.523
1972	6288.905
1973	8298.421
1974	7601.691
1975	8188.411
1976	7282.662
1977	7447.677
1978	9119.829
1979	8536.776
1980	8452.435
1981	7414.674
1982	6219.232
1983	6450.253
1984	5144.801
1985	5045.792
1986	4550.747
1987	5383.156
1988	4528.745
1989	6728.945
1990	7532.018
1991	7755.705
1992	7715.368
1993	8005.061
1994	8195.745
1995	9178.501
1996	9702.882
1997	10131.921
1998	9717.55
1999	9977.907
2000	10307.937
2001	10615.965
2002	10241.931
2003	10667.303
2004	10670.97
2005	10498.621
2006	11496.045
2007	9651.544
2008	10208.928
2009	7741.037
2010	7297.33
2011	7858.381
2012	7462.345
2013	8093.069
2014	7422.008