Year	Tonnes
1990	29336
1991	58672
1992	91675
1993	132012
1994	176016
1995	223687
1996	271358
1997	326363
1998	385035
1999	451041
2000	520714
2001	594054
2002	693063
2003	795739
2004	898415
2005	1019426
2006	1162439
2007	1327454
2008	1507137
2009	1686820
2010	1877504
2011	2068188
2012	2266206
2013	2464224
2014	2669576