Year	Tonnes
1928	3160.954
1929	3050.944
1930	3087.614
1931	2937.267
1932	2981.271
1933	2999.606
1934	3065.612
1935	3028.942
1936	3113.283
1937	3219.626
1938	3091.281
1939	3234.294
1940	3175.622
1941	3186.623
1942	1026.76
1943	410.704
1944	308.028
1945	297.027
1946	7.334
1947	25.669
1948	154.014
1949	102.676
1950	803.073
1951	916.75
1952	1133.103
1953	1305.452
1954	1463.133
1955	1422.796
1956	1657.484
1957	2101.191
1958	2412.886
1959	2779.586
1960	2717.247
1961	2592.569
1962	2882.262
1963	2636.573
1964	2860.26
1965	2728.248
1966	2808.922
1967	3619.329
1968	2929.933
1969	3215.959
1970	4616.753
1971	5104.464
1972	4899.112
1973	4110.707
1974	4675.425
1975	4587.417
1976	4899.112
1977	5174.137
1978	5155.802
1979	5100.797
1980	5526.169
1981	5639.846
1982	5599.509
1983	5775.525
1984	6571.264
1985	6710.61
1986	6791.284
1987	4976.119
1988	4118.041
1989	4462.739
1990	4275.722
1991	4180.38
1992	4888.111
1993	5342.819
1994	6244.901
1995	6959.966
1996	7256.993
1997	7499.015
1998	8078.401
1999	8969.482
2000	10087.917
2001	8723.793
2002	9207.837
2003	9845.895
2004	12434.797
2005	11598.721
2006	12849.168
2007	12874.837
2008	9801.891
2009	10230.93
2010	12515.471
2011	14297.633
2012	11070.673
2013	12860.169
2014	21631.633