Year	metric tons
1961	14787753
1962	21386977
1963	21114354
1964	19500269
1965	20103932
1966	16155821
1967	20958955
1968	24069845
1969	22002233
1970	21442559
1971	22248849
1972	26299491
1973	19794838
1974	23851158
1975	24456532
1976	27796801
1977	20110915
1978	24831772
1979	21851834
1980	26591773
1981	25194986
1982	25118562
1983	23914245
1984	21578202
1985	32109145
1986	33284038
1987	28324916
1988	37757734
1989	32330064
1990	36730398.33
1991	45387445.42999999
1992	42140299.33
1993	39510082.53
1994	46336512.910000004
1995	37046278.21000001
1996	52178398.54
1997	38776478.12
1998	46516092.18000001
1999	39105615.98
2000	35754893.52
2001	43885566.67
2002	46321670.93
2003	55876427.91000001
2004	52439428.160000004
2005	52652117.88999999
2006	58159843.91
2007	50080840.29
2008	46099234.660000004
2009	57157966.120000005
2010	48184810.11
2011	55175301.29000001
2012	52361550.71999999
2013	60074665.25
2014	57495448.51
2015	55210085.61
2016	49923164.64999999
2017	53017142.66
2018	51785227.16
2019	57161266.27000001
2020	55098287.62
2021	54033921.89
2022	50024191.42