Year	metric tons
1960	0
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	5
1973	10
1974	15
1975	25
1976	40
1977	60
1978	90
1979	130
1980	170
1981	200
1982	220
1983	250
1984	272
1985	270
1986	271
1987	252
1988	254
1989	1180
1990	1070
1991	1230
1992	1230
1993	1135
1994	1235
1995	1161
1996	1161
1997	1150
1998	1150
1999	1135
2000	1100
2001	1135
2002	1135
2003	1100
2004	1205
2005	1214
2006	1214
2007	1216
2008	1216
2009	1249
2010	1261
2011	1466
2012	1471
2013	1593
2014	1593
2015	1593
2016	1733
2017	1733
2018	1843
2019	2358.1
2020	2358.1
2021	2364
2022	2500