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	48829.74
1985	43363
1986	56743.39
1987	43562.22
1988	51607.07
1989	50148.79
1990	41409.36
1991	63011.77
1992	47115.72
1993	43633.03
1994	47522.3
1995	64194.41
1996	52458.45
1997	61302.49
1998	60739.59
1999	54570.6
2000	19579.34
2001	24553.36
2002	26258.55
2003	37099.22
2004	36756.869999999995
2005	32779.94
2006	40879.26
2007	33016.78
2008	28617.9
2009	32682.399999999998
2010	44649.66
2011	45938.76
2012	45884.47
2013	48523.88
2014	82882.70999999999
2015	80198.99
2016	76158.86
2017	54774.5
2018	68166.61
2019	73910.88
2020	46409.67
2021	62293.02
2022	59717.39