Year	Tonnes
1915	18.335
1916	66.006
1917	223.687
1918	399.703
1919	370.367
1920	487.711
1921	572.052
1922	304.361
1923	473.043
1924	542.716
1925	645.392
1926	876.413
1927	968.088
1928	968.088
1929	931.418
1930	938.752
1931	883.747
1932	678.395
1933	634.391
1934	700.397
1935	696.73
1936	788.405
1937	979.089
1938	975.422
1939	821.408
1940	836.076
1941	990.09
1942	1243.113
1943	1364.124
1944	1657.484
1945	1382.459
1946	1639.149
1947	1562.142
1948	1639.149
1949	1485.135
1950	2258.872
1951	1686.82
1952	2181.865
1953	2438.555
1954	2574.234
1955	2698.912
1956	3014.274
1957	3186.623
1958	3725.672
1959	3567.991
1960	3406.643
1961	4114.374
1962	4180.38
1963	5350.153
1964	7275.328
1965	11763.736
1966	12907.84
1967	12838.167
1968	6633.603
1969	12112.101
1970	21539.958
1971	32280.601
1972	41426.099
1973	49577.84
1974	62291.329
1975	47395.975
1976	55247.022
1977	50567.93
1978	48294.39
1979	70289.056
1980	68154.862
1981	65958.329
1982	65602.63
1983	59929.781
1984	69625.329
1985	69893.02
1986	73505.015
1987	59343.061
1988	70747.431
1989	42441.858
1990	39196.563
1991	42273.176
1992	46614.904
1993	45137.103
1994	35199.533
1995	35841.258
1996	39665.939
1997	42328.181
1998	37869.109
1999	40285.662
2000	76057.247
2001	85734.46
2002	93677.182
2003	101616.237
2004	104304.148
2005	106067.975
2006	98891.656
2007	95055.974
2008	96148.74
2009	76735.642
2010	91517.319
2011	95694.032
2012	98502.954
2013	98136.254
2014	96280.752