Year	metric tons
1960	600
1961	600
1962	600
1963	600
1964	800
1965	800
1966	900
1967	1000
1968	1100
1969	1100
1970	1419
1971	1519
1972	1519
1973	1627
1974	1700
1975	2000
1976	2200
1977	2500
1978	2600
1979	1024
1980	969
1981	891
1982	921
1983	910
1984	946
1985	1152
1986	940
1987	751
1988	826
1989	847
1990	988
1991	1056
1992	1128
1993	1404
1994	1356
1995	1354
1996	1414
1997	1419
1998	1711
1999	2037
2000	2028
2001	2189
2002	1913
2003	1690
2004	1712
2005	1605
2006	1657.24
2007	1742.39
2008	1902.04
2009	2078.36
2010	1984.9
2011	1832.8
2012	1971.41
2013	2035.94
2014	2017.64
2015	2056.57
2016	2150.08
2017	2118.96
2018	2079.92
2019	1964.82
2020	1515.72
2021	1625.19
2022	1652.0800000000002