Year	Tonnes
1950	286.026
1951	293.36
1952	300.694
1953	304.361
1954	487.711
1955	590.387
1956	689.396
1957	762.736
1958	1136.77
1959	1345.789
1960	1294.451
1961	1393.46
1962	1972.846
1963	1602.479
1964	2046.186
1965	1958.178
1966	1954.511
1967	2152.529
1968	2482.559
1969	2684.244
1970	2849.259
1971	3036.276
1972	3281.965
1973	3479.983
1974	3751.341
1975	4066.703
1976	4404.067
1977	4972.452
1978	5782.859
1979	6299.906
1980	6879.292
1981	6644.604
1982	6761.948
1983	6996.636
1984	6450.253
1985	9028.154
1986	9673.546
1987	10586.629
1988	11595.054
1989	10568.294
1990	9988.908
1991	12159.772
1992	11019.335
1993	9284.844
1994	7946.389
1995	7920.72
1996	8041.731
1997	7708.034
1998	7708.034
1999	7554.02
2000	7506.349
2001	7884.05
2002	8287.42
2003	8034.397
2004	8551.444
2005	8562.445
2006	9394.854
2007	12064.43
2008	12038.761
2009	13102.191
2010	13820.923
2011	21499.621
2012	26226.384
2013	38752.856
2014	20839.561