Year	Tonnes
1950	11.001
1951	11.001
1952	11.001
1953	11.001
1954	29.336
1955	36.67
1956	36.67
1957	33.003
1958	47.671
1959	47.671
1960	22.002
1961	22.002
1962	22.002
1963	25.669
1964	25.669
1965	29.336
1966	25.669
1967	25.669
1968	29.336
1969	44.004
1970	36.67
1971	66.006
1972	88.008
1973	29.336
1974	51.338
1975	62.339
1976	62.339
1977	62.339
1978	69.673
1979	62.339
1980	58.672
1981	69.673
1982	73.34
1983	62.339
1984	80.674
1985	66.006
1986	80.674
1987	99.009
1988	106.343
1989	117.344
1990	66.006
1991	143.013
1992	157.681
1993	99.009
1994	33.003
1995	128.345
1996	113.677
1997	289.693
1998	165.015
1999	465.709
2000	454.708
2001	3094.948
2002	4979.786
2003	6017.547
2004	5218.141
2005	4712.095
2006	4756.099
2007	4796.436
2008	4503.076
2009	4620.42
2010	4679.092
2011	6127.557
2012	5115.465
2013	5163.136
2014	5346.486