Year	Tonnes
1850	396.036
1880	352.032
1881	352.032
1910	216.353
1913	223.687
1914	249.356
1915	227.354
1916	242.022
1917	256.69
1918	245.689
1919	249.356
1920	293.36
1921	238.355
1924	6692.275
1925	6039.549
1926	8104.07
1927	6736.279
1928	6490.59
1929	10007.243
1930	9559.869
1931	9849.562
1932	6431.918
1933	9273.843
1934	9490.196
1935	9541.534
1936	10153.923
1937	10362.942
1938	9974.24
1939	11540.049
1940	11532.715
1941	8456.102
1942	7022.305
1943	7117.647
1944	6362.245
1945	6838.955
1946	8203.079
1947	8819.135
1948	8452.435
1949	8353.426
1950	9735.885
1951	10516.956
1952	9629.542
1953	9545.201
1954	9101.494
1955	11727.066
1956	10934.994
1957	9728.551
1958	8965.815
1959	12324.787
1960	11180.683
1961	12365.124
1962	13120.526
1963	13461.557
1964	14231.627
1965	13732.915
1966	15111.707
1967	16413.492
1968	17821.62
1969	18514.683
1970	19413.098
1971	22497.045
1972	22053.338
1973	22860.078
1974	23303.785
1975	22053.338
1976	22295.36
1977	23567.809
1978	23571.476
1979	27388.823
1980	26255.72
1981	26039.367
1982	25547.989
1983	25709.337
1984	25529.654
1985	26725.096
1986	28525.593
1987	30197.745
1988	29842.046
1989	30018.062
1990	31217.171
1991	31400.521
1992	31033.821
1993	31261.175
1994	32672.97
1995	32969.997
1996	34906.173
1997	36416.977
1998	38554.838
1999	40153.65
2000	41228.081
2001	44029.669
2002	43413.613
2003	42687.547
2004	43761.978
2005	43538.291
2006	43160.59
2007	44638.391
2008	42999.242
2009	40314.998
2010	40054.641
2011	35632.239
2012	35591.902
2013	34854.835
2014	34066.43