Year	Tonnes
1959	62.339
1960	55.005
1961	51.338
1962	84.341
1963	91.675
1964	99.009
1965	106.343
1966	84.341
1967	117.344
1968	124.678
1969	161.348
1970	124.678
1971	150.347
1972	121.011
1973	161.348
1974	150.347
1975	183.35
1976	183.35
1977	198.018
1978	194.351
1979	201.685
1980	209.019
1981	209.019
1982	205.352
1983	205.352
1984	216.353
1985	179.683
1986	187.017
1987	198.018
1988	66.006
1989	102.676
1990	143.013
1991	66.006
1992	84.341
1993	91.675
1994	102.676
1995	110.01
1996	124.678
1997	143.013
1998	150.347
1999	161.348
2000	176.016
2001	172.349
2002	168.682
2003	381.368
2004	377.701
2005	399.703
2006	407.037
2007	462.042
2008	509.713
2009	491.378
2010	517.047
2011	539.049
2012	612.389
2013	700.397
2014	729.733