Year	metric tons
1960	18637
1961	17404
1962	23901
1963	80479
1964	72557
1965	73350
1966	91626
1967	96450
1968	105769
1969	80605
1970	124058
1971	151885
1972	163955
1973	265546
1974	343865
1975	352495
1976	412663
1977	493461
1978	395177
1979	484844
1980	545133
1981	704890
1982	603311
1983	645426
1984	679342
1985	790769
1986	952388
1987	875568
1988	898649
1989	858573
1990	788565
1991	787977
1992	955477
1993	1056503
1994	1092988
1995	1017254
1996	897041
1997	1040210
1998	796632
1999	777711
2000	667883
2001	668022
2002	794340
2003	839845
2004	952856
2005	1057725
2006	1279163
2007	1399075
2008	1394818
2009	1331719
2010	1377233
2011	1499335
2012	1509226
2013	1533446
2014	1567442
2015	1676485
2016	1859220
2017	2334719
2018	2278850
2019	2399720
2020	2334232.18
2021	2427676.98