Year	Tonnes
1961	7334
1962	18335
1963	36670
1964	55005
1965	66006
1966	77007
1967	99009
1968	132012
1969	143013
1970	165015
1971	194351
1972	220020
1973	256690
1974	289693
1975	322696
1976	355699
1977	377701
1978	399703
1979	425372
1980	454708
1981	484044
1982	509713
1983	531715
1984	553717
1985	575719
1986	594054
1987	616056
1988	638058
1989	660060
1990	682062
1991	704064
1992	729733
1993	759069
1994	788405
1995	817741
1996	850744
1997	876413
1998	905749
1999	935085
2000	964421
2001	990090
2002	1030427
2003	1070764
2004	1114768
2005	1177107
2006	1246780
2007	1298118
2008	1353123
2009	1393460
2010	1455799
2011	1518138
2012	1580477
2013	1642816
2014	1705155