Year	metric tons
1961	641800
1962	603000
1963	653000
1964	661000
1965	684000
1966	724000
1967	791624
1968	718758
1969	719867
1970	685874
1971	649343
1972	758000
1973	900000
1974	801000
1975	542000
1976	756000
1977	738000
1978	682000
1979	621940
1980	663000
1981	663000
1982	633000
1983	623000
1984	665000
1985	746000
1986	829000
1987	569000
1988	562000
1989	607000
1990	738050
1991	551080.44
1992	244554.12
1993	765216.14
1994	790926.67
1995	1126331.22
1996	1378290.74
1997	1529972.48
1998	1687210.58
1999	1813596.09
2000	1587548
2001	1507208
2002	1361337
2003	1514953
2004	1327853
2005	1142170
2006	1725608
2007	1438604
2008	1455084
2009	2239000
2010	2803055
2011	2931539
2012	2898581
2013	1686308
2014	1945426
2015	1732713
2016	1701088
2017	1774100
2018	2018388
2019	2009423
2020	2187422
2021	2398744
2022	2506062