Year	Tonnes
1962	84.341
1963	84.341
1964	36.67
1965	47.671
1966	44.004
1967	40.337
1968	55.005
1969	58.672
1970	58.672
1971	62.339
1972	66.006
1973	69.673
1974	73.34
1975	176.016
1976	267.691
1977	267.691
1978	289.693
1979	297.027
1980	495.045
1981	601.388
1982	608.722
1983	696.73
1984	634.391
1985	616.056
1986	597.721
1987	616.056
1988	696.73
1989	689.396
1990	542.716
1991	487.711
1992	487.711
1993	495.045
1994	473.043
1995	462.042
1996	480.377
1997	498.712
1998	487.711
1999	509.713
2000	528.048
2001	531.715
2002	531.715
2003	520.714
2004	528.048
2005	528.048
2006	528.048
2007	557.384
2008	542.716
2009	575.719
2010	590.387
2011	663.727
2012	737.067
2013	803.073
2014	839.743