Year	metric tons
1960	2100
1961	900
1962	500
1963	1100
1964	1000
1965	1100
1966	900
1967	1300
1968	2600
1969	3000
1970	3701
1971	4906
1972	5512
1973	3423
1974	3809
1975	4258
1976	5019
1977	4654
1978	4069
1979	3692
1980	5639
1981	5811
1982	6982
1983	7078
1984	15322
1985	11964
1986	12741
1987	18693
1988	18327
1989	20790
1990	26673
1991	27749
1992	27157
1993	30158
1994	28615
1995	27366
1996	34925
1997	36854
1998	42375
1999	43856
2000	51247
2001	60940
2002	62568
2003	62516
2004	58359
2005	60050
2006	53122
2007	57104
2008	44867.5
2009	47511.68
2010	46490.3
2011	44266.32
2012	36102.01
2013	34198.2
2014	31200.2
2015	39650
2016	40244.43
2017	45433.1
2018	36895.9
2019	37913.7
2020	37750.7
2021	42099
2022	44014