Year	Tonnes
1986	179683
1987	627057
1988	1239446
1989	1888505
1990	3527654
1991	5210807
1992	6673940
1993	8269085
1994	9882565
1995	11551050
1996	13241537
1997	14987029
1998	16783859
1999	18591690
2000	20971573
2001	23380792
2002	25819347
2003	28382580
2004	31000818
2005	33721732
2006	36438979
2007	39262569
2008	41921144
2009	44550383
2010	47058611
2011	49559505
2012	50908961
2013	51770706
2014	52643452