Year	metric tons
1961	1537830
1962	3511979
1963	3856071
1964	3403305
1965	3486365
1966	2179840
1967	3523200
1968	6352730
1969	4089600
1970	4251560
1971	5352461
1972	5167140
1973	3228970
1974	4809380
1975	3728620
1976	5713380
1977	2888140
1978	4744560
1979	4103160
1980	4514720
1981	2130300
1982	4916509
1983	3581070
1984	3759130
1985	5312160
1986	7824550
1987	4336810
1988	7958960
1989	7428590
1990	6275864
1991	8664685
1992	2950232.19
1993	2817864.04
1994	9638630
1995	1783230
1996	10103303.7
1997	4097670.63
1998	6629516.41
1999	3843292.32
2000	1996648.9
2001	4603349.74
2002	5287814.6
2003	7969118.32
2004	8598634.63
2005	4279354.31
2006	9236077.13
2007	2505021.89
2008	5330290.42
2009	10443719.48
2010	7834479.24
2011	8689334
2012	5311218.76
2013	9874542.88
2014	6936819.24
2015	11687921.96
2016	3560828.31
2017	9787464.69
2018	10389766.77
2019	5316232.56
2020	3325551.12
2021	10452190.15
2022	3509673.38