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	0
1973	0
1974	41
1975	31
1976	31
1977	31
1978	31
1979	31
1980	31
1981	36
1982	46
1983	50
1984	60
1985	56
1986	57
1987	50
1988	58
1989	83
1990	125
1991	127
1992	155
1993	259
1994	291
1995	452
1996	787
1997	969
1998	1178
1999	1422
2000	1878
2001	1883
2002	1862
2003	1821
2004	3545
2005	3620
2006	3607
2007	3200
2008	3786
2009	3345.7
2010	4098.8
2011	4666.98
2012	4333.71
2013	5339.1
2014	4835.34
2015	5847.54
2016	6624.86
2017	7275.11
2018	7347.04
2019	8079.13
2020	7342.6
2021	7862.26
2022	7593.9