Year	Tonnes
1928	11.001
1929	18.335
1930	36.67
1931	36.67
1932	25.669
1933	25.669
1934	36.67
1935	36.67
1936	51.338
1937	58.672
1938	77.007
1939	80.674
1992	14143.619
1993	12016.759
1994	10912.992
1995	9442.525
1996	9149.165
1997	8456.102
1998	8063.733
1999	6780.283
2000	6351.244
2001	6985.635
2002	6912.295
2003	7370.67
2004	7403.673
2005	7506.349
2006	8012.395
2007	8316.756
2008	7902.385
2009	7231.324
2010	8074.734
2011	7293.663
2012	7062.642
2013	7080.977
2014	6974.634