Year	Tonnes
1964	3278.298
1965	3916.356
1966	3501.985
1967	4792.769
1968	4572.749
1969	4275.722
1970	3769.676
1971	3791.678
1972	4066.703
1973	4591.084
1974	4202.382
1975	4081.371
1976	4026.366
1977	3744.007
1978	3476.316
1979	3604.661
1980	3531.321
1981	3366.306
1982	3520.32
1983	3270.964
1984	2819.923
1985	2753.917
1986	2889.596
1987	2702.579
1988	3142.619
1989	2603.57
1990	2445.889
1991	2416.553
1992	2456.89
1993	2500.894
1994	2420.22
1995	2170.864
1996	1870.17
1997	2390.884
1998	2313.877
1999	1807.831
2000	1822.499
2001	1906.84
2002	1983.847
2003	2112.192
2004	2145.195
2005	2288.208
2006	2291.875
2007	1928.842
2008	2170.864
2009	2508.228
2010	2691.578
2011	2937.267
2012	3667
2013	3956.693
2014	4503.076