Year	Tonnes
1959	11.001
1960	11.001
1961	11.001
1962	18.335
1963	22.002
1964	18.335
1965	22.002
1966	25.669
1967	916.75
1968	1243.113
1969	20524.199
1970	15247.386
1971	21184.259
1972	23454.132
1973	30630.451
1974	31327.181
1975	31070.491
1976	39651.271
1977	38785.859
1978	44814.407
1979	36607.661
1980	36904.688
1981	36857.017
1982	36871.685
1983	35342.546
1984	46394.884
1985	49926.205
1986	47234.627
1987	47693.002
1988	48367.73
1989	54487.953
1990	52009.061
1991	57010.849
1992	58136.618
1993	65980.331
1994	73130.981
1995	70641.088
1996	41059.399
1997	41646.119
1998	81495.408
1999	78374.791
2000	112562.232
2001	101414.552
2002	84704.033
2003	106841.712
2004	113240.627
2005	116148.558
2006	123874.927
2007	135627.662
2008	157354.637
2009	167959.601
2010	160812.618
2011	165440.372
2012	176386.367
2013	170706.184
2014	211369.547