Year	Tonnes
1955	102.676
1956	132.012
1957	161.348
1958	198.018
1959	212.686
1960	234.688
1961	286.026
1962	308.028
1963	388.702
1964	341.031
1965	403.37
1966	469.376
1967	418.038
1968	491.378
1969	1345.789
1970	1173.44
1971	249.356
1972	117.344
1973	128.345
1974	73.34
1975	73.34
1976	73.34
1977	73.34
1978	51.338
1979	29.336
1980	286.026
1981	300.694
1982	337.364
1983	366.7
1984	410.704
1985	418.038
1986	432.706
1987	436.373
1988	451.041
1989	451.041
1990	1261.448
1991	1305.452
1992	1349.456
1993	1386.126
1994	1477.801
1995	1551.141
1996	1617.147
1997	1540.14
1998	1950.844
1999	1895.839
2000	1976.513
2001	2251.538
2002	2207.534
2003	2379.883
2004	2445.889
2005	2775.919
2006	2999.606
2007	3465.315
2008	3898.021
2009	4653.423
2010	5012.789
2011	5207.14
2012	5456.496
2013	5603.176
2014	6684.941