Year	Tonnes
1990	51.338
1991	51.338
1992	55.005
1993	66.006
1994	66.006
1995	66.006
1996	69.673
1997	69.673
1998	77.007
1999	80.674
2000	88.008
2001	95.342
2002	95.342
2003	102.676
2004	121.011
2005	128.345
2006	143.013
2007	150.347
2008	150.347
2009	146.68
2010	150.347
2011	143.013
2012	143.013
2013	135.679
2014	143.013