Year	Tonnes
1961	7.334
1962	11.001
1963	18.335
1964	18.335
1965	11.001
1966	11.001
1967	22.002
1968	33.003
1969	11.001
1970	22.002
1971	29.336
1972	25.669
1973	36.67
1974	33.003
1975	33.003
1976	33.003
1977	22.002
1978	22.002
1979	25.669
1980	29.336
1981	29.336
1982	25.669
1983	22.002
1984	22.002
1985	22.002
1986	18.335
1987	22.002
1988	22.002
1989	22.002
1990	22.002
1991	22.002
1992	25.669
1993	29.336
1994	29.336
1995	29.336
1996	33.003
1997	25.669
1998	29.336
1999	29.336
2000	29.336
2001	25.669
2002	40.337
2003	40.337
2004	44.004
2005	62.339
2006	69.673
2007	51.338
2008	55.005
2009	40.337
2010	62.339
2011	62.339
2012	62.339
2013	62.339
2014	62.339