Year	Tonnes
1902	0
1903	0
1905	0
1906	3.667
1907	0
1908	0
1909	0
1910	0
1911	135.679
1912	253.023
1913	854.411
1914	1173.44
1915	1404.461
1916	2009.516
1917	2801.588
1918	3450.647
1919	4323.393
1920	5441.828
1921	7260.66
1922	9233.506
1923	11587.72
1924	13516.562
1925	14213.292
1926	15071.37
1927	16714.186
1928	17693.275
1929	17036.882
1930	18529.351
1931	17938.964
1932	20106.161
1933	22104.676
1934	23512.804
1935	23358.79
1936	25573.658
1937	31715.883
1938	31803.891
1939	30076.734
1940	27150.468
1941	20839.561
1942	29556.02
1943	30480.104
1944	41693.79
1945	52940.479
1946	60281.813
1947	63519.774
1948	78015.425
1949	84102.645
1950	0
1951	6919.629
1952	4096.039
1953	3832.015
1954	1045.095
1955	15826.772
1956	22827.075
1957	21818.65
1958	25250.962
1959	25591.993
1960	37392.399
1961	36541.655
1962	37462.072
1963	41341.758
1964	47560.99
1965	53765.554
1966	64161.499
1967	67942.176
1968	82404.824
1969	83116.222
1970	91873.018
1971	101722.58
1972	106115.646
1973	129595.447
1974	143911.415
1975	139349.667
1976	156643.239
1977	163969.905
1978	162470.102
1979	164028.577
1980	120900.99
1981	112899.596
1982	138007.545
1983	149785.949
1984	150658.695
1985	160768.614
1986	148399.823
1987	159573.172
1988	176115.009
1989	191204.714
1990	210463.798
1991	227401.671
1992	228468.768
1993	237214.563
1994	265230.443
1995	272942.144
1996	276059.094
1997	269293.479
1998	308508.377
1999	382339.755
2000	372237.17
2001	398437.885
2002	401760.187
2003	418437.703
2004	447036.636
2005	468807.615
2006	509338.966
2007	519324.207
2008	541582.897
2009	554278.051
2010	573031.089
2011	589055.879
2012	611758.276
2013	619778.005
2014	649480.705