Year	metric tons
1961	9285
1962	9053
1963	9173
1964	9397
1965	9417
1966	8850
1967	8862
1968	8796
1969	8458
1970	8595
1971	8635
1972	6800
1973	7900
1974	8368
1975	7750
1976	8400
1977	9070
1978	9890
1979	10570
1980	10830
1981	10487
1982	11400
1983	12800
1984	13662
1985	13500
1986	21060
1987	23858
1988	25421
1989	20695
1990	23664
1991	24677
1992	25369.94
1993	27320
1994	30506
1995	29451.62
1996	29311.16
1997	24896.67
1998	27128.84
1999	27760.83
2000	26900
2001	26168.46
2002	25046.04
2003	32075.3
2004	31334.8
2005	35308.98
2006	33170.89
2007	34100
2008	36286.75
2009	39782.49
2010	40754
2011	42405.02
2012	43407.52
2013	44201.82
2014	44781.36
2015	45415.03
2016	45999.72
2017	46425.6
2018	47181.39
2019	46535.57
2020	46714.19
2021	46810.38
2022	46686.71