Year	Tonnes
1950	25.669
1951	29.336
1952	33.003
1953	22.002
1954	36.67
1955	40.337
1956	47.671
1957	58.672
1958	62.339
1959	69.673
1960	73.34
1961	84.341
1962	91.675
1963	113.677
1964	124.678
1965	150.347
1966	179.683
1967	212.686
1968	216.353
1969	223.687
1970	319.029
1971	330.03
1972	348.365
1973	385.035
1974	425.372
1975	484.044
1976	630.724
1977	649.059
1978	718.732
1979	916.75
1980	814.074
1981	784.738
1982	865.412
1983	902.082
1984	997.424
1985	993.757
1986	1078.098
1987	1173.44
1988	1345.789
1989	1389.793
1990	1103.767
1991	1364.124
1992	1540.14
1993	1441.131
1994	1624.481
1995	1763.827
1996	1943.51
1997	2233.203
1998	2519.229
1999	2570.567
2000	2860.26
2001	3039.943
2002	3017.941
2003	2977.604
2004	3006.94
2005	3446.98
2006	3622.996
2007	3861.351
2008	3945.692
2009	4103.373
2010	4169.379
2011	4272.055
2012	4250.053
2013	4099.706
2014	4173.046