Year	Tonnes
1950	267.691
1951	282.359
1952	315.362
1953	366.7
1954	443.707
1955	451.041
1956	674.728
1957	817.741
1958	766.403
1959	832.409
1960	887.414
1961	865.412
1962	905.749
1963	986.423
1964	1001.091
1965	1151.438
1966	1243.113
1967	1364.124
1968	1624.481
1969	1672.152
1970	1705.155
1971	1884.838
1972	2405.552
1973	2500.894
1974	1925.175
1975	1980.18
1976	2464.224
1977	2669.576
1978	2808.922
1979	3003.273
1980	3208.625
1981	3047.277
1982	3102.282
1983	3098.615
1984	3182.956
1985	3102.282
1986	3545.989
1987	4121.708
1988	4129.042
1989	4341.728
1990	4374.731
1991	4690.093
1992	5181.471
1993	5449.162
1994	5643.513
1995	5383.156
1996	5936.873
1997	5859.866
1998	6406.249
1999	6376.913
2000	6930.63
2001	6846.289
2002	7022.305
2003	7748.371
2004	7334
2005	7502.682
2006	7788.708
2007	8195.745
2008	8577.113
2009	8111.404
2010	7708.034
2011	7425.675
2012	6919.629
2013	5947.874
2014	6061.551