Year	metric tons
1960	4000
1961	4000
1962	5000
1963	5000
1964	5300
1965	5300
1966	7300
1967	7400
1968	7400
1969	7400
1970	8500
1971	13511
1972	17005
1973	15924
1974	19676
1975	16940
1976	26284
1977	22863
1978	29192
1979	35431
1980	34866
1981	34728
1982	32518
1983	46014.59
1984	48801.74
1985	43363
1986	56743.39
1987	43556.22
1988	51602.07
1989	50145.79
1990	41404.36
1991	63005.77
1992	47107.72
1993	43623.03
1994	47509.3
1995	64181.41
1996	52445.45
1997	61289.49
1998	60726.59
1999	54557.6
2000	19564.34
2001	24538.36
2002	26252.55
2003	36699.22
2004	35045.67
2005	30171.14
2006	39525.66
2007	32150.18
2008	27457.7
2009	28652.6
2010	37544.66
2011	38720.16
2012	38892.07
2013	36708.88
2014	70717.31
2015	67995.99
2016	65572.36
2017	49988
2018	62640.11
2019	68303.88
2020	40902.67
2021	49829.28
2022	47838.09