Year	metric tons
1960	574647
1961	637492
1962	785102
1963	847904
1964	871061
1965	840830
1966	850802
1967	1070415
1968	1466808
1969	1275401
1970	1226500
1971	1400901
1972	1442920
1973	1443661
1974	1835370
1975	1767039
1976	1919197
1977	1806612
1978	1750769
1979	1741256
1980	2032073
1981	1859445
1982	1931373
1983	1870909
1984	1851484
1985	1796989
1986	1849758
1987	1707816
1988	1974414
1989	1929294
1990	1517646
1991	1793244
1992	1997091
1993	1654028
1994	1916208
1995	2043763
1996	1723442
1997	1866549
1998	1599703
1999	1447670
2000	1577698
2001	1552267
2002	1474374
2003	1068993
2004	1133410
2005	949610
2006	904909
2007	684221
2008	726650
2009	812882.4
2010	864264
2011	752305
2012	537375.54
2013	706187.2
2014	779725.2
2015	904852.7
2016	706560
2017	941987
2018	825635
2019	678639.49
2020	775529.39
2021	507002.33
2022	496114.2