Year	Tonnes
1991	1056.096
1992	1151.438
1993	1389.793
1994	1584.144
1995	1631.815
1996	1749.159
1997	1796.83
1998	1906.84
1999	1664.818
2000	1642.816
2001	2016.85
2002	1760.16
2003	1873.837
2004	1961.845
2005	2310.21
2006	2332.212
2007	2361.548
2008	3325.969
2009	3069.279
2010	3102.282
2011	2830.924
2012	3384.641
2013	2629.239
2014	3755.008