Year	Tonnes
1964	29336
1965	62339
1966	95342
1967	143013
1968	190684
1969	256690
1970	322696
1971	410704
1972	487711
1973	572052
1974	671061
1975	773737
1976	876413
1977	990090
1978	1103767
1979	1217444
1980	1342122
1981	1466800
1982	1591478
1983	1716156
1984	1840834
1985	1965512
1986	2126860
1987	2284541
1988	2442222
1989	2599903
1990	2724581
1991	2849259
1992	2970270
1993	3083947
1994	3193957
1995	3300300
1996	3402976
1997	3505652
1998	3604661
1999	3696336
2000	3780677
2001	3861351
2002	3938358
2003	4004364
2004	4070370
2005	4132709
2006	4176713
2007	4220717
2008	4264721
2009	4305058
2010	4349062
2011	4389399
2012	4429736
2013	4473740
2014	4521411