Year	Tonnes
1950	7334
1951	14668
1952	22002
1953	29336
1954	36670
1955	44004
1956	51338
1957	58672
1958	66006
1959	73340
1960	84341
1961	95342
1962	106343
1963	117344
1964	128345
1965	139346
1966	150347
1967	165015
1968	179683
1969	190684
1970	216353
1971	234688
1972	256690
1973	282359
1974	304361
1975	337364
1976	366700
1977	396036
1978	432706
1979	473043
1980	513380
1981	561051
1982	605055
1983	652726
1984	700397
1985	748068
1986	795739
1987	850744
1988	920417
1989	990090
1990	1067097
1991	1162439
1992	1232112
1993	1316453
1994	1408128
1995	1503470
1996	1580477
1997	1679486
1998	1767494
1999	1877504
2000	1972846
2001	2060854
2002	2163530
2003	2280874
2004	2390884
2005	2504561
2006	2632906
2007	2746583
2008	2867594
2009	2999606
2010	3116950
2011	3219626
2012	3325969
2013	3439646
2014	3560657