Year	Tonnes
1990	1474.134
1991	1529.139
1992	1587.811
1993	1635.482
1994	1675.819
1995	1708.822
1996	1738.158
1997	1771.161
1998	1804.164
1999	1826.166
2000	1851.835
2001	1877.504
2002	1906.84
2003	1932.509
2004	1983.847
2005	2013.183
2006	2038.852
2007	2075.522
2008	2126.86
2009	2218.535
2010	2277.207
2011	2332.212
2012	2405.552
2013	2434.888
2014	2467.891