Year	metric tons
1961	636853
1962	475400
1963	598736
1964	630051
1965	613599
1966	503539
1967	623516
1968	820025
1969	641797
1970	825996
1971	864078
1972	810533
1973	912389
1974	1099286
1975	765664
1976	846193
1977	1077885
1978	1125550
1979	1104407
1980	1150900
1981	1133100
1982	1200660
1983	1072450
1984	1407200
1985	1302100
1986	1109110
1987	1285019
1988	1065792
1989	1179600
1990	1567856
1991	1482090
1992	1010010
1993	1383645
1994	1091070
1995	1227030
1996	1345340
1997	1290495
1998	1371430
1999	1221910
2000	1305420
2001	1221040
2002	1143021
2003	1287340
2004	1444570
2005	1298530
2006	1169160
2007	1202380
2008	1386930
2009	1054900
2010	1205800
2011	1026770
2012	1084690
2013	965230
2014	1238100
2015	1357900
2016	1326000
2017	1307300
2018	743100
2019	1296400
2020	1311300
2021	1184700
2022	1325000