Year	Tonnes
1950	14.668
1951	14.668
1952	11.001
1953	11.001
1954	14.668
1955	14.668
1956	18.335
1957	22.002
1958	25.669
1959	18.335
1960	18.335
1961	22.002
1962	25.669
1963	29.336
1964	29.336
1965	29.336
1966	33.003
1967	33.003
1968	36.67
1969	47.671
1970	47.671
1971	55.005
1972	66.006
1973	62.339
1974	62.339
1975	99.009
1976	99.009
1977	113.677
1978	139.346
1979	146.68
1980	157.681
1981	157.681
1982	161.348
1983	161.348
1984	172.349
1985	172.349
1986	161.348
1987	179.683
1988	183.35
1989	179.683
1990	176.016
1991	179.683
1992	179.683
1993	187.017
1994	187.017
1995	198.018
1996	198.018
1997	198.018
1998	212.686
1999	231.021
2000	245.689
2001	253.023
2002	289.693
2003	289.693
2004	293.36
2005	293.36
2006	308.028
2007	352.032
2008	366.7
2009	381.368
2010	432.706
2011	447.374
2012	454.708
2013	432.706
2014	513.38