Year	Tonnes
1992	234.688
1993	234.688
1994	234.688
1995	234.688
1996	234.688
1997	238.355
1998	238.355
1999	242.022
2000	249.356
2001	253.023
2002	249.356
2003	253.023
2004	253.023
2005	260.357
2006	264.024
2007	260.357
2008	253.023
2009	245.689
2010	253.023
2011	253.023
2012	253.023
2013	256.69
2014	260.357