Year	metric tons
1961	23000
1962	22695
1963	22217
1964	18424
1965	14776
1966	14796
1967	17249
1968	22240
1969	19913
1970	21541
1971	18006
1972	18015
1973	17413
1974	17820
1975	23293
1976	21768
1977	18475
1978	17105
1979	19917
1980	18896
1981	18458
1982	21342
1983	17951
1984	24233
1985	29296
1986	26249
1987	24333
1988	33601
1989	32622
1990	28477
1991	29575.06
1992	23482.62
1993	22844.23
1994	19586.89
1995	19771
1996	19465.86
1997	18539.28
1998	6424.1
1999	18058.74
2000	14182.41
2001	14895.99
2002	13515.59
2003	16550.34
2004	14429.07
2005	15948.78
2006	13701.07
2007	15206
2008	12231
2009	12140
2010	8616.84
2011	8142.78
2012	4857.86
2013	7710
2014	7843.06
2015	7427.98
2016	9540.67
2017	10065.79
2018	8282.71
2019	8013.34
2020	10574.69
2021	11829.73
2022	14700.23