Year	Tonnes
1992	12478.801
1993	13164.53
1994	13340.546
1995	14403.976
1996	14954.026
1997	15859.775
1998	15192.381
1999	15236.385
2000	14396.642
2001	15163.045
2002	15419.735
2003	15511.41
2004	15746.098
2005	15867.109
2006	16244.81
2007	16244.81
2008	17355.911
2009	15280.389
2010	15335.394
2011	15089.705
2012	14781.677
2013	14150.953
2014	12812.498