Year	Tonnes
1941	11.001
1942	11.001
1943	11.001
1948	3.667
1949	3.667
1950	88.008
1951	62.339
1952	99.009
1953	183.35
1954	271.358
1955	227.354
1956	242.022
1957	322.696
1958	319.029
1959	337.364
1960	352.032
1961	341.031
1962	396.036
1963	421.705
1964	407.037
1965	645.392
1966	825.075
1967	1074.431
1968	1727.157
1969	1668.485
1970	1653.817
1971	1851.835
1972	1408.128
1973	1752.826
1974	1738.158
1975	1210.11
1976	1177.107
1977	1048.762
1978	1371.458
1979	1848.168
1980	1822.499
1981	1866.503
1982	1481.468
1983	1844.501
1984	1664.818
1985	1815.165
1986	2214.868
1987	2581.568
1988	2673.243
1989	2827.257
1990	3017.941
1991	2984.938
1992	2966.603
1993	3028.942
1994	2240.537
1995	2563.233
1996	2860.26
1997	3050.944
1998	3219.626
1999	3157.287
2000	3549.656
2001	4352.729
2002	4521.411
2003	4987.12
2004	5295.148
2005	5119.132
2006	5504.167
2007	6013.88
2008	6578.598
2009	6629.936
2010	6585.932
2011	7726.369
2012	8562.445
2013	10634.3
2014	11598.721