Year	Tonnes
1992	234688
1993	469376
1994	704064
1995	938752
1996	1173440
1997	1411795
1998	1650150
1999	1892172
2000	2141528
2001	2394551
2002	2643907
2003	2896930
2004	3149953
2005	3410310
2006	3674334
2007	3934691
2008	4187714
2009	4433403
2010	4686426
2011	4939449
2012	5192472
2013	5449162
2014	5709519