Year	Tonnes
1950	638.058
1951	876.413
1952	869.079
1953	1019.426
1954	1004.758
1955	1188.108
1956	1078.098
1957	1294.451
1958	1364.124
1959	1323.787
1960	1463.133
1961	1345.789
1962	1433.797
1963	1723.49
1964	1650.15
1965	1705.155
1966	1441.131
1967	1496.136
1968	1763.827
1969	1690.487
1970	2625.572
1971	2295.542
1972	2423.887
1973	2475.225
1974	2937.267
1975	2746.583
1976	2434.888
1977	3003.273
1978	2970.27
1979	2658.575
1980	2559.566
1981	3047.277
1982	3043.61
1983	3655.999
1984	2581.568
1985	3325.969
1986	3047.277
1987	3285.632
1988	3450.647
1989	3344.304
1990	3817.347
1991	3934.691
1992	3982.362
1993	4547.08
1994	4954.117
1995	5276.813
1996	5610.51
1997	6365.912
1998	6402.582
1999	6549.262
2000	6288.905
2001	6919.629
2002	7422.008
2003	7631.027
2004	7348.668
2005	6992.969
2006	9358.184
2007	9827.56
2008	9138.164
2009	7708.034
2010	9955.905
2011	9831.227
2012	11877.413
2013	14620.329
2014	14466.315