Year	Tonnes
1950	7334
1951	18335
1952	29336
1953	40337
1954	51338
1955	62339
1956	73340
1957	84341
1958	99009
1959	113677
1960	135679
1961	154014
1962	179683
1963	194351
1964	216353
1965	238355
1966	267691
1967	304361
1968	344698
1969	392369
1970	436373
1971	484044
1972	531715
1973	586720
1974	623390
1975	671061
1976	718732
1977	766403
1978	817741
1979	865412
1980	913083
1981	971755
1982	1034094
1983	1096433
1984	1158772
1985	1221111
1986	1287117
1987	1360457
1988	1455799
1989	1558475
1990	1664818
1991	1774828
1992	1892172
1993	2013183
1994	2156196
1995	2306543
1996	2460557
1997	2629239
1998	2805255
1999	2999606
2000	3190290
2001	3384641
2002	3589993
2003	3806346
2004	4011698
2005	4228051
2006	4459072
2007	4697427
2008	4950450
2009	5203473
2010	5463830
2011	5716853
2012	5988211
2013	6292572
2014	6534594