Year	Tonnes
1950	3.667
1951	3.667
1952	3.667
1953	3.667
1954	3.667
1955	3.667
1956	3.667
1957	3.667
1958	3.667
1959	3.667
1960	33.003
1961	3.667
1964	11.001
1965	80.674
1966	201.685
1967	227.354
1968	278.692
1969	304.361
1970	366.7
1971	399.703
1972	381.368
1973	370.367
1974	311.695
1975	337.364
1976	333.697
1977	341.031
1978	440.04
1979	447.374
1980	465.709
1981	436.373
1982	436.373
1983	271.358
1984	333.697
1985	440.04
1986	458.375
1987	436.373
1988	436.373
1989	436.373
1990	425.372
1991	326.363
1992	264.024
1993	132.012
1994	484.044
1995	454.708
1996	341.031
1997	1202.776
1998	1213.777
1999	1239.446
2000	1188.108
2001	1144.104
2002	1125.769
2003	1041.428
2004	1030.427
2005	1019.426
2006	1015.759
2007	1063.43
2008	1096.433
2009	1045.095
2010	1037.761
2011	1048.762
2012	1206.443
2013	1089.099
2014	1202.776