Year	metric tons
1960	900
1961	800
1962	900
1963	1000
1964	300
1965	300
1966	300
1967	300
1968	300
1969	300
1970	300
1971	300
1972	100
1973	200
1974	380
1975	300
1976	230
1977	230
1978	230
1979	231
1980	251
1981	385
1982	426
1983	409
1984	409
1985	380
1986	409
1987	426
1988	454
1989	399
1990	360
1991	252
1992	275
1993	300
1994	320
1995	350
1996	400
1997	500
1998	600
1999	700
2000	800
2001	900
2002	1000
2003	1100
2004	1200
2005	1571
2006	1299
2007	1229
2008	1206
2009	1058
2010	1590
2011	1667
2012	2167
2013	1702
2014	2298
2015	2012
2016	2220
2017	2022
2018	2102
2019	2270.14
2020	2322.5
2021	3088.9
2022	3120.5