Year	Tonnes
1959	33.003
1960	36.67
1961	47.671
1962	62.339
1963	88.008
1964	117.344
1965	161.348
1966	179.683
1967	198.018
1968	234.688
1969	275.025
1970	429.039
1971	399.703
1972	447.374
1973	469.376
1974	484.044
1975	509.713
1976	517.047
1977	557.384
1978	583.053
1979	605.055
1980	630.724
1981	663.727
1982	883.747
1983	938.752
1984	872.746
1985	656.393
1986	374.034
1987	3285.632
1988	3230.627
1989	2849.259
1990	905.749
1991	920.417
1992	968.088
1993	982.756
1994	1144.104
1995	1074.431
1996	1114.768
1997	1118.435
1998	1122.102
1999	1147.771
2000	1173.44
2001	1272.449
2002	1349.456
2003	1389.793
2004	1536.473
2005	1587.811
2006	1609.813
2007	1844.501
2008	1936.176
2009	2123.193
2010	2236.87
2011	2394.551
2012	2654.908
2013	2669.576
2014	2709.913