Year	Tonnes
1958	165.015
1959	157.681
1960	410.704
1961	616.056
1962	660.06
1963	696.73
1964	700.397
1965	696.73
1966	718.732
1967	726.066
1968	748.068
1969	748.068
1970	792.072
1971	814.074
1972	832.409
1973	803.073
1974	839.743
1975	843.41
1976	887.414
1977	902.082
1978	902.082
1979	946.086
1980	964.421
1981	990.09
1982	982.756
1983	953.42
1984	979.089
1985	993.757
1986	997.424
1987	993.757
1988	1026.76
1989	1045.095
1990	1004.758
1991	1026.76
1992	1059.763
1993	1089.099
1994	1250.447
1995	1290.784
1996	1364.124
1997	1419.129
1998	1503.47
1999	1580.477
2000	1642.816
2001	1719.823
2002	1804.164
2003	1881.171
2004	1943.51
2005	1826.166
2006	1892.172
2007	1969.179
2008	2189.199
2009	2262.539
2010	2603.57
2011	2779.586
2012	2581.568
2013	2299.209
2014	2449.556