Year	Tonnes
1969	11001
1970	22002
1971	33003
1972	44004
1973	55005
1974	66006
1975	80674
1976	95342
1977	124678
1978	154014
1979	179683
1980	209019
1981	275025
1982	326363
1983	377701
1984	399703
1985	421705
1986	443707
1987	465709
1988	487711
1989	509713
1990	546383
1991	583053
1992	619723
1993	660060
1994	700397
1995	740734
1996	788405
1997	836076
1998	883747
1999	931418
2000	979089
2001	1012092
2002	1041428
2003	1074431
2004	1129436
2005	1191775
2006	1257781
2007	1323787
2008	1393460
2009	1463133
2010	1532806
2011	1602479
2012	1672152
2013	1741825
2014	1811498