Year	metric tons
1960	10000
1961	12500
1962	13750
1963	15150
1964	16100
1965	17280
1966	18590
1967	19230
1968	19800
1969	20300
1970	19500
1971	19000
1972	22600
1973	21626
1974	21791
1975	21950
1976	21923
1977	21889
1978	21787
1979	21619
1980	22570
1981	26330
1982	26180
1983	27790
1984	16473
1985	18315
1986	16997
1987	17948
1988	17970
1989	20548
1990	17600
1991	14434
1992	14230
1993	9492
1994	9899
1995	9360
1996	8080
1997	9334
1998	10222
1999	11947
2000	12886
2001	13056
2002	11574
2003	11870
2004	12744
2005	13661
2006	14686
2007	15864
2008	15687
2009	14825
2010	14245
2011	15584
2012	15133
2013	14918
2014	15326
2015	17337
2016	16247.97
2017	18257.5
2018	17852.3
2019	17283.31
2020	18373.33
2021	17846.74
2022	18947.76