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	3916
1988	2042
1989	2318
1990	2354
1991	1652
1992	1709
1993	1764
1994	4517
1995	4822
1996	5848
1997	4678
1998	5221
1999	3380
2000	2600
2001	1696
2002	2215
2003	1949
2004	2632
2005	3163
2006	2754
2007	3172
2008	2830
2009	2391
2010	2850.98
2011	2684
2012	5073
2013	3386.85
2014	3897.07
2015	4353.14
2016	14239.63
2017	13496
2018	14811.99
2019	14623.57
2020	16591.07
2021	20062.92
2022	21080