Year	Tonnes
1986	3039.943
1987	2702.579
1988	2662.242
1989	5067.794
1990	5427.16
1991	4330.727
1992	3567.991
1993	5507.834
1994	5280.48
1995	5225.475
1996	4888.111
1997	5115.465
1998	282.359
1999	2115.859
2000	5614.177
2001	5716.853
2002	5511.501
2003	5515.168
2004	5786.526
2005	5735.188
2006	5977.21
2007	6728.945
2008	6472.255
2009	6622.602
2010	4561.748
2011	5819.529