Year	Tonnes
1945	3.667
1946	487.711
1947	898.415
1948	1672.152
1949	2178.198
1950	2185.532
1951	2926.266
1952	3465.315
1953	4697.427
1954	5163.136
1955	6450.253
1956	7561.354
1957	8221.414
1958	9017.153
1959	11232.021
1960	12552.141
1961	14462.648
1962	17278.904
1963	21103.585
1964	22218.353
1965	25005.273
1966	30014.395
1967	35151.862
1968	37242.052
1969	42522.532
1970	53783.889
1971	58616.995
1972	60336.818
1973	73094.311
1974	75686.88
1975	81829.105
1976	93306.815
1977	105712.276
1978	113405.642
1979	133211.109
1980	134868.593
1981	139742.036
1982	141905.566
1983	150904.384
1984	163911.233
1985	178333.544
1986	182451.585
1987	192660.513
1988	221959.843
1989	235846.772
1990	246943.114
1991	261482.769
1992	284280.508
1993	321951.599
1994	344037.94
1995	374771.067
1996	403780.704
1997	430032.757
1998	364833.497
1999	399864.348
2000	447561.017
2001	450193.923
2002	465631.993
2003	466215.046
2004	482276.506
2005	462922.08
2006	470655.783
2007	495675.724
2008	507589.807
2009	508862.256
2010	566716.515
2011	589400.577
2012	583966.083
2013	592499.192
2014	587156.373