Year	metric tons
1960	931042
1961	1036870
1962	1123387
1963	1213157
1964	1213316
1965	1242713
1966	1358682
1967	1296355
1968	1495890
1969	1404864
1970	1396089
1971	1317649
1972	1174655
1973	1169095
1974	1045856
1975	1031900
1976	1134435
1977	1271867
1978	1408150
1979	1450442
1980	1376925
1981	1448401
1982	1430442
1983	1375319
1984	1312249
1985	1482788
1986	1544397
1987	1631973
1988	1728032
1989	1682396
1990	1726748
1991	1548466
1992	1375876
1993	1214701
1994	1112524
1995	945560
1996	998319
1997	1082952
1998	1122419
1999	1160246
2000	1160351
2001	1229970
2002	1277887
2003	1321586
2004	1358662
2005	1300181
2006	1294235
2007	1197468
2008	1123423
2009	1149101
2010	1138105
2011	1109394.33
2012	1019314.23
2013	1061015.03
2014	1024114.5
2015	1058610.2
2016	1087523.97
2017	1045716.16
2018	1045463.69
2019	1040635.66
2020	935145.97
2021	944369.17
2022	870639.83