Year	Tonnes
1950	11.001
1951	25.669
1952	25.669
1953	29.336
1954	33.003
1955	36.67
1956	29.336
1957	44.004
1958	47.671
1959	36.67
1960	40.337
1961	44.004
1962	47.671
1963	66.006
1964	84.341
1965	121.011
1966	139.346
1967	88.008
1968	121.011
1969	84.341
1970	139.346
1971	161.348
1972	190.684
1973	179.683
1974	194.351
1975	198.018
1976	198.018
1977	198.018
1978	201.685
1979	363.033
1980	348.365
1981	300.694
1982	348.365
1983	348.365
1984	352.032
1985	359.366
1986	377.701
1987	388.702
1988	348.365
1989	388.702
1990	322.696
1991	311.695
1992	311.695
1993	311.695
1994	304.361
1995	304.361
1996	311.695
1997	326.363
1998	315.362
1999	315.362
2000	341.031
2001	366.7
2002	399.703
2003	421.705
2004	407.037
2005	414.371
2006	410.704
2007	462.042
2008	498.712
2009	462.042
2010	517.047
2011	473.043
2012	517.047
2013	608.722
2014	722.399