Year	metric tons
1961	347182462
1962	367732867
1963	395824005
1964	417092032
1965	415613455
1966	439651026
1967	468551824
1968	474245764
1969	482452734
1970	521259950
1971	549922826
1972	538052187
1973	564577265
1974	577913064
1975	616846515
1976	635454824
1977	634014203
1978	681354701
1979	679622666
1980	695245647
1981	732048482
1982	756914084
1983	805256988
1984	844407484
1985	831590753
1986	848947581
1987	844714061
1988	877522081
1989	909439602
1990	940074002.64
1991	949165605.71
1992	1139117284.81
1993	1154358187.3
1994	1122229733.3999999
1995	1125341699.8400002
1996	1177130756.8400006
1997	1221928061.0300002
1998	1184499578.08
1999	1195344228.5999997
2000	1158110297.3300002
2001	1228252480.03
2002	1195890135.7099998
2003	1192255598.4099998
2004	1280436962.9700003
2005	1295940347.48
2006	1316368699.7900002
2007	1351686929.43
2008	1468701350.0800002
2009	1432413828.8200004
2010	1432489581.57
2011	1559150498.0400002
2012	1548777886.9799998
2013	1648140752.4500003
2014	1670234562.7999997
2015	1711859280.1499999
2016	1724982063.1100001
2017	1820190477.51
2018	1791636224.7000008
2019	1830312921.6599998
2020	1856507770.2199996
2021	1891731964.4700003
2022	1917998659.3700004