Year	Tonnes
1950	7.334
1951	11.001
1952	11.001
1953	11.001
1954	14.668
1955	14.668
1956	14.668
1957	14.668
1958	18.335
1959	22.002
1960	22.002
1961	22.002
1962	22.002
1963	25.669
1964	29.336
1965	36.67
1966	44.004
1967	69.673
1968	84.341
1969	84.341
1970	102.676
1971	102.676
1972	102.676
1973	117.344
1974	102.676
1975	117.344
1976	275.025
1977	341.031
1978	330.03
1979	546.383
1980	374.034
1981	326.363
1982	363.033
1983	385.035
1984	355.699
1985	366.7
1986	366.7
1987	418.038
1988	517.047
1989	671.061
1990	630.724
1991	667.394
1992	704.064
1993	700.397
1994	616.056
1995	583.053
1996	487.711
1997	469.376
1998	612.389
1999	465.709
2000	465.709
2001	509.713
2002	458.375
2003	601.388
2004	572.052
2005	553.717
2006	473.043
2007	564.718
2008	557.384
2009	590.387
2010	638.058
2011	641.725
2012	590.387
2013	630.724
2014	733.4