Year	Tonnes
1933	3.667
1934	7.334
1935	3.667
1945	7.334
1947	3.667
1948	3.667
1949	3.667
1950	304.361
1951	245.689
1952	308.028
1953	253.023
1954	289.693
1955	304.361
1956	319.029
1957	315.362
1958	374.034
1959	374.034
1960	399.703
1961	355.699
1962	396.036
1963	462.042
1964	484.044
1965	557.384
1966	579.386
1967	843.41
1968	913.083
1969	850.744
1970	971.755
1971	1026.76
1972	1287.117
1973	1074.431
1974	1188.108
1975	1694.154
1976	993.757
1977	847.077
1978	1019.426
1979	1133.103
1980	1617.147
1981	1026.76
1982	1015.759
1983	652.726
1984	869.079
1985	1056.096
1986	1140.437
1987	1287.117
1988	1290.784
1989	931.418
1990	949.753
1991	1034.094
1992	1004.758
1993	1030.427
1994	1268.782
1995	1265.115
1996	1364.124
1997	1650.15
1998	1738.158
1999	1917.841
2000	1873.837
2001	1741.825
2002	1235.779
2003	1701.488
2004	1807.831
2005	1741.825
2006	1683.153
2007	1815.165
2008	1888.505
2009	1771.161
2010	1958.178
2011	2339.546
2012	2706.246
2013	3116.95
2014	3076.613