Year	metric tons
1960	100
1961	100
1962	200
1963	200
1964	200
1965	200
1966	200
1967	100
1968	100
1969	100
1970	100
1971	200
1972	100
1973	100
1974	92
1975	65
1976	49
1977	31
1978	31
1979	36
1980	56
1981	35
1982	34
1983	32
1984	132
1985	197
1986	267
1987	322
1988	372
1989	407
1990	412
1991	390
1992	402
1993	455
1994	496
1995	595
1996	621
1997	650
1998	763
1999	1025
2000	1119
2001	1060
2002	1041
2003	1131
2004	981
2005	1071
2006	1057
2007	1015
2008	1040
2009	1009
2010	1027
2011	1075
2012	1206.53
2013	1292.24
2014	1546.15
2015	1554.33
2016	1721.1399999999999
2017	1854.45
2018	1994.8600000000001
2019	2618.73
2020	2638.95
2021	2810
2022	3257