Year	metric tons
1960	1300
1961	1600
1962	1700
1963	3200
1964	4200
1965	4100
1966	3500
1967	3200
1968	4600
1969	4800
1970	5200
1971	4600
1972	5600
1973	9200
1974	6810
1975	5906
1976	7053
1977	4594
1978	5086
1979	7885
1980	10658
1981	12003
1982	13169
1983	12852
1984	13925
1985	17202.9
1986	17289.1
1987	20452
1988	12940
1989	21884
1990	19775
1991	17454
1992	13661
1993	14204
1994	26814
1995	20080
1996	13683
1997	15212
1998	10981
1999	9166
2000	13140
2001	15864
2002	20815
2003	20041
2004	16223
2005	12173
2006	13936
2007	14789
2008	16462
2009	15463
2010	15770
2011	16152.9
2012	14694.63
2013	14763.58
2014	15964.06
2015	14184.89
2016	16735.68
2017	18363.54
2018	16929.42
2019	19231.010000000002
2020	17494.129999999997
2021	21416.88
2022	21760