Year	metric tons
1961	159
1962	210
1963	262
1964	313
1965	364
1966	426
1967	279
1968	174
1969	83
1970	240
1971	70
1972	25
1973	767
1974	822
1975	2070
1976	146
1977	83
1978	28
1979	40
1980	17
1981	102
1982	57
1983	25
1984	5
1985	5
1986	5
1987	5
1988	6
1989	11
1990	7
1991	4
1992	8
1993	10
1994	11
1995	11
1996	9
1997	96.44
1998	92.01
1999	95.89
2000	99.46
2001	110.32
2002	109.84
2003	176.82
2004	132
2005	120
2006	135
2007	138
2008	145
2009	146.53
2010	163.77
2011	171.94
2012	185.49
2013	195.47
2014	195.07
2015	196.88
2016	202.06
2017	198.23
2018	205.88
2019	203.29
2020	203.74
2021	205.17
2022	204.4