Year	Tonnes
1962	44.004
1963	47.671
1964	47.671
1965	36.67
1966	47.671
1967	47.671
1968	55.005
1969	73.34
1970	62.339
1971	73.34
1972	73.34
1973	73.34
1974	91.675
1975	77.007
1976	88.008
1977	99.009
1978	102.676
1979	110.01
1980	146.68
1981	157.681
1982	157.681
1983	205.352
1984	220.02
1985	231.021
1986	234.688
1987	249.356
1988	227.354
1989	267.691
1990	209.019
1991	238.355
1992	216.353
1993	227.354
1994	234.688
1995	238.355
1996	242.022
1997	249.356
1998	249.356
1999	253.023
2000	271.358
2001	205.352
2002	212.686
2003	161.348
2004	198.018
2005	154.014
2006	187.017
2007	187.017
2008	190.684
2009	190.684
2010	212.686
2011	242.022
2012	282.359
2013	289.693
2014	440.04