Year	metric tons
1960	800
1961	900
1962	900
1963	1000
1964	1000
1965	1100
1966	1200
1967	1200
1968	1300
1969	1300
1970	1500
1971	1500
1972	1500
1973	1500
1974	1560
1975	1570
1976	1644
1977	2193
1978	2704
1979	2792
1980	2225
1981	2367
1982	2357
1983	3055
1984	3425
1985	3967
1986	4106
1987	3914
1988	2040
1989	2316
1990	2348
1991	1651
1992	1692
1993	1728
1994	4445
1995	4719
1996	5729
1997	4521
1998	5049
1999	3186
2000	2487
2001	1597
2002	2058
2003	1789
2004	1923
2005	2709
2006	2279
2007	2550
2008	2357
2009	1958
2010	2351
2011	2154
2012	4523
2013	2826
2014	3186
2015	3370
2016	13292
2017	11864
2018	13566
2019	13690.39
2020	13091.04
2021	15295
2022	16060