Year	metric tons
1960	7300
1961	8000
1962	8200
1963	8400
1964	9200
1965	9600
1966	10600
1967	9900
1968	10200
1969	10300
1970	11100
1971	10700
1972	10400
1973	12400
1974	9654
1975	8730
1976	7201
1977	6368
1978	9540
1979	12738
1980	13958
1981	20770
1982	12916
1983	7603
1984	12189
1985	16098
1986	20446
1987	21534
1988	11733
1989	10637
1990	9159
1991	11327
1992	12615
1993	13079
1994	14883
1995	15590
1996	14791
1997	12281
1998	11377
1999	10194
2000	9851
2001	20004
2002	36724
2003	36615
2004	44634
2005	43317
2006	46296
2007	58398
2008	57104
2009	52779.71
2010	44082.93
2011	59286.7
2012	57382
2013	55425
2014	64959
2015	61255.71
2016	66513.76999999999
2017	70627.97
2018	68044.66
2019	61592.740000000005
2020	68052.39
2021	71768.74
2022	73033.98999999999