Year	metric tons
1960	298411
1961	292822
1962	264216
1963	380537
1964	407931
1965	465971
1966	491057
1967	589875
1968	615626
1969	680442
1970	774029
1971	821315
1972	875967
1973	890832
1974	1011497
1975	1172822
1976	1148240
1977	1065084
1978	1015943
1979	1168372
1980	1318916
1981	1334949
1982	1401652
1983	1607417
1984	1562449.0899999999
1985	1531357.12
1986	1536910.1300000001
1987	1610305.4
1988	1631572.8
1989	1268185.7
1990	979588.7
1991	934117
1992	7135478.28
1993	5795014.27
1994	5156540.01
1995	5926763.35
1996	6080216.7
1997	5956224.29
1998	5773991.58
1999	5498584.090000001
2000	5255837.24
2001	4794926.32
2002	4402149.34
2003	4335353.64
2004	4039338.63
2005	4184971.09
2006	4324569.2299999995
2007	4650105.03
2008	4460532.08
2009	4931634.7
2010	5154900.9
2011	5340038.2700000005
2012	5295112.51
2013	5351047.84
2014	5108929.769999999
2015	5439061.8
2016	5644159.07
2017	5882494.9399999995
2018	6129222.72
2019	6195640.57
2020	6134487.329999999
2021	6164016.359999999
2022	5932215.510000001