Year	Tonnes
1950	25.669
1951	29.336
1952	29.336
1953	36.67
1954	40.337
1955	44.004
1956	47.671
1957	55.005
1958	58.672
1959	66.006
1960	80.674
1961	80.674
1962	88.008
1963	99.009
1964	150.347
1965	179.683
1966	190.684
1967	212.686
1968	253.023
1969	399.703
1970	227.354
1971	198.018
1972	267.691
1973	421.705
1974	425.372
1975	352.032
1976	282.359
1977	337.364
1978	330.03
1979	513.38
1980	542.716
1981	454.708
1982	443.707
1983	495.045
1984	704.064
1985	678.395
1986	704.064
1987	872.746
1988	993.757
1989	913.083
1990	634.391
1991	960.754
1992	1331.121
1993	1466.8
1994	1697.821
1995	2035.185
1996	2486.226
1997	2783.253
1998	2251.538
1999	3219.626
2000	3069.279
2001	3267.297
2002	2625.572
2003	2841.925
2004	2669.576
2005	3083.947
2006	2563.233
2007	2614.571
2008	3421.311
2009	4334.394
2010	5056.793
2011	5533.503
2012	5856.199
2013	6637.27
2014	8030.73