Year	metric tons
1960	147800
1961	160100
1962	179877
1963	198200
1964	192300
1965	208500
1966	246800
1967	315100
1968	353800
1969	318800
1970	307452
1971	337219
1972	326872
1973	401900
1974	473420
1975	442196
1976	481497
1977	572564
1978	629671
1979	632290
1980	614931
1981	727392
1982	675223
1983	748723
1984	735024.4
1985	745432.4
1986	770663.3
1987	864581.57
1988	828913.18
1989	890140.09
1990	956078.2
1991	915076.79
1992	1025978.76
1993	1049044.14
1994	1067894.49
1995	1116462
1996	1134254
1997	1176342
1998	1156948
1999	1255929
2000	1293397
2001	1238860
2002	1279653
2003	1291121
2004	1339771
2005	1218264
2006	1290377
2007	1389534
2008	1402330
2009	1401503
2010	1437456
2011	1382880.85
2012	1481361.21
2013	1492620
2014	1468726
2015	1496053.98
2016	1584371.02
2017	1474370
2018	1463031.39
2019	1465095.14
2020	1391044.75
2021	1338230.65
2022	1318358.54