Year	metric tons
1961	503194
1962	491776
1963	456941
1964	458636
1965	448234
1966	532604
1967	558240
1968	654274
1969	645935
1970	666231
1971	672000
1972	701555
1973	712224
1974	735654
1975	759021
1976	773400
1977	779900
1978	770800
1979	868800
1980	889000
1981	940900
1982	981290
1983	1010485
1984	1057866
1985	1141300
1986	1192860
1987	1256060
1988	1332440
1989	1414920
1990	1490658
1991	1458967.22
1992	1502518.78
1993	1607622
1994	1659940
1995	1479045.06
1996	1556773.16
1997	1531845.47
1998	1621402.78
1999	1592753
2000	1572045
2001	1546061
2002	1520470
2003	1521340
2004	1522295
2005	1523240
2006	1524145
2007	1525030
2008	1525860
2009	1526862
2010	2591311
2011	2656556.47
2012	2644174.79
2013	2858786.59
2014	3097523.77
2015	3120941.02
2016	3293367.73
2017	3459463.81
2018	3533729.68
2019	3576518.5
2020	3720568.5
2021	3882132.7
2022	4043069.51