Year	Tonnes
1950	550.05
1951	722.399
1952	759.069
1953	832.409
1954	817.741
1955	927.751
1956	898.415
1957	1155.105
1958	1290.784
1959	1367.791
1960	1360.457
1961	1386.126
1962	1485.135
1963	1679.486
1964	1859.169
1965	2427.554
1966	2643.907
1967	3186.623
1968	3105.949
1969	4184.047
1970	4855.108
1971	4983.453
1972	5379.489
1973	5427.16
1974	5683.85
1975	4239.052
1976	3755.008
1977	3806.346
1978	3439.646
1979	3571.658
1980	3747.674
1981	3641.331
1982	3828.348
1983	3909.022
1984	3505.652
1985	4074.037
1986	4250.053
1987	3351.638
1988	4847.774
1989	3758.675
1990	5221.808
1991	4891.778
1992	4378.398
1993	3021.608
1994	4147.377
1995	4297.724
1996	4433.403
1997	5419.826
1998	4697.427
1999	5093.463
2000	5533.503
2001	6369.579
2002	8118.738
2003	9072.158
2004	11463.042
2005	10982.665
2006	12013.092
2007	14125.284
2008	14913.689
2009	15562.748
2010	15940.449
2011	15658.09
2012	14642.331
2013	15474.74
2014	15364.73