Year	Tonnes
1992	10777.313
1993	10340.94
1994	10469.285
1995	10839.652
1996	11741.734
1997	10634.3
1998	12625.481
1999	11723.399
2000	12064.43
2001	11998.424
2002	10934.994
2003	11309.028
2004	11191.684
2005	11279.692
2006	10938.661
2007	9493.863
2008	9402.188
2009	8698.124
2010	8602.782
2011	9398.521
2012	8965.815
2013	7847.38
2014	7510.016