Year	Tonnes
1958	25.669
1959	22.002
1960	29.336
1961	55.005
1962	66.006
1963	88.008
1964	95.342
1965	91.675
1966	135.679
1967	132.012
1968	161.348
1969	190.684
1970	216.353
1971	231.021
1972	253.023
1973	330.03
1974	289.693
1975	333.697
1976	333.697
1977	366.7
1978	418.038
1979	480.377
1980	572.052
1981	685.729
1982	748.068
1983	964.421
1984	993.757
1985	997.424
1986	902.082
1987	1001.091
1988	990.09
1989	1041.428
1990	733.4
1991	722.399
1992	700.397
1993	781.071
1994	773.737
1995	810.407
1996	902.082
1997	909.416
1998	957.087
1999	953.42
2000	696.73
2001	656.393
2002	700.397
2003	759.069
2004	814.074
2005	715.065
2006	693.063
2007	722.399
2008	810.407
2009	968.088
2010	1173.44
2011	1327.454
2012	1866.503
2013	1939.843
2014	2126.86