Year	Tonnes
1992	16417.159
1993	16750.856
1994	16490.499
1995	16985.544
1996	16956.208
1997	18907.052
1998	20153.832
1999	19992.484
2000	19339.758
2001	20395.854
2002	21473.952
2003	22984.756
2004	22376.034
2005	22592.387
2006	22607.055
2007	23828.166
2008	22592.387
2009	21165.924
2010	20172.167
2011	19809.134
2012	17993.969
2013	17550.262
2014	16842.531