Year	Tonnes
1950	157.681
1951	95.342
1952	179.683
1953	168.682
1954	124.678
1955	183.35
1956	179.683
1957	388.702
1958	209.019
1959	234.688
1960	715.065
1961	289.693
1962	326.363
1963	370.367
1964	304.361
1965	282.359
1966	300.694
1967	253.023
1968	385.035
1969	1107.434
1970	872.746
1971	803.073
1972	678.395
1973	539.049
1974	520.714
1975	524.381
1976	451.041
1977	513.38
1978	711.398
1979	678.395
1980	608.722
1981	693.063
1982	553.717
1983	689.396
1984	616.056
1985	663.727
1986	674.728
1987	498.712
1988	458.375
1989	374.034
1990	487.711
1991	546.383
1992	447.374
1993	447.374
1994	513.38
1995	399.703
1996	473.043
1997	443.707
1998	414.371
1999	366.7
2000	425.372
2001	568.385
2002	608.722
2003	652.726
2004	641.725
2005	546.383
2006	733.4
2007	641.725
2008	663.727
2009	652.726
2010	726.066
2011	898.415
2012	1030.427
2013	1191.775
2014	1309.119