Year	Tonnes
1950	909.416
1951	1393.46
1952	1591.478
1953	1514.471
1954	1701.488
1955	1987.514
1956	2222.202
1957	2284.541
1958	2090.19
1959	2211.201
1960	2427.554
1961	2401.885
1962	2625.572
1963	2856.593
1964	2827.257
1965	2467.891
1966	2684.244
1967	2702.579
1968	2819.923
1969	3131.618
1970	3083.947
1971	3685.335
1972	3872.352
1973	3920.023
1974	4950.45
1975	4976.119
1976	4609.419
1977	5056.793
1978	5324.484
1979	5038.458
1980	6197.23
1981	6527.26
1982	4693.76
1983	4660.757
1984	4319.726
1985	3769.676
1986	4162.045
1987	5174.137
1988	4789.102
1989	5192.472
1990	5823.196
1991	4840.44
1992	5540.837
1993	6347.577
1994	6556.596
1995	7554.02
1996	9328.848
1997	8265.418
1998	10036.579
1999	10172.258
2000	10417.947
2001	9369.185
2002	7968.391
2003	6754.614
2004	7623.693
2005	8562.445
2006	9574.537
2007	9831.227
2008	10241.931
2009	12350.456
2010	12174.44
2011	13457.89
2012	12515.471
2013	13333.212
2014	14286.632