Year	Tonnes
1950	300.694
1951	348.365
1952	359.366
1953	333.697
1954	377.701
1955	436.373
1956	454.708
1957	575.719
1958	586.72
1959	586.72
1960	616.056
1961	737.067
1962	700.397
1963	711.398
1964	722.399
1965	751.735
1966	806.74
1967	876.413
1968	1224.778
1969	1177.107
1970	1389.793
1971	1331.121
1972	1536.473
1973	1510.804
1974	1558.475
1975	1668.485
1976	1778.495
1977	2002.182
1978	2049.853
1979	1932.509
1980	2057.187
1981	1822.499
1982	1763.827
1983	2002.182
1984	1987.514
1985	1906.84
1986	1848.168
1987	2174.531
1988	2504.561
1989	2728.248
1990	2592.569
1991	2698.912
1992	3076.613
1993	2849.259
1994	3336.97
1995	3879.686
1996	3960.36
1997	4158.378
1998	4649.756
1999	4741.431
2000	5031.124
2001	5713.186
2002	6090.887
2003	6769.282
2004	7367.003
2005	7554.02
2006	7007.637
2007	8778.798
2008	8672.455
2009	7873.049
2010	7975.725
2011	8954.814
2012	8984.15
2013	9064.824
2014	9471.861