Year	Tonnes
1992	43432.93617
1993	37820.75601
1994	36791.73925
1995	38863.82078
1996	45490.96969
1997	48876.5402
1998	51457.86211
1999	35485.27428
2000	39422.2292
2001	42351.23937
2002	45276.73753
2003	48419.97986
2004	52918.85519
2005	50091.6931
2006	54007.576
2007	52456.435
2008	52097.069
2009	46182.198
2010	45954.844
2011	49218.474
2012	44062.672
2013	44884.08
2014	37667.424