Year	Tonnes
1950	62.339
1951	47.671
1952	102.676
1953	121.011
1954	183.35
1955	190.684
1956	198.018
1957	212.686
1958	242.022
1959	304.361
1960	304.361
1961	363.033
1962	392.369
1963	410.704
1964	432.706
1965	550.05
1966	513.38
1967	487.711
1968	590.387
1969	520.714
1970	744.401
1971	634.391
1972	715.065
1973	869.079
1974	953.42
1975	839.743
1976	1034.094
1977	1158.772
1978	1459.466
1979	1331.121
1980	1492.469
1981	1389.793
1982	1367.791
1983	1415.462
1984	1496.136
1985	1551.141
1986	1664.818
1987	1892.172
1988	2163.53
1989	2244.204
1990	2163.53
1991	2134.194
1992	2530.23
1993	2867.594
1994	3432.312
1995	3964.027
1996	3751.341
1997	4195.048
1998	4503.076
1999	4503.076
2000	3689.002
2001	3821.014
2002	3898.021
2003	4070.37
2004	4088.705
2005	3832.015
2006	3986.029
2007	4136.376
2008	4451.738
2009	4561.748
2010	5097.13
2011	5320.817
2012	5284.147
2013	5434.494
2014	5702.185