Year	metric tons
1961	161517152
1962	176891847
1963	193664704
1964	211518168
1965	218796712
1966	236666995
1967	238484340
1968	240583076
1969	243373838
1970	273263415
1971	284937214
1972	273042550
1973	298389812
1974	310431189
1975	323534701
1976	331298092
1977	322848184
1978	361005645
1979	381564830
1980	379085958
1981	392257532
1982	421390639
1983	458361080
1984	483833443
1985	461903806
1986	475595259
1987	477524085
1988	480878846
1989	502446335
1990	538624147.56
1991	535117490.38
1992	548448601.04
1993	552680441.3199999
1994	544992193.1400001
1995	571176609.4999999
1996	610430386.23
1997	602082891.48
1998	616734128.26
1999	624808798.3399999
2000	582847771.3900001
2001	577792228.79
2002	581246997.9399999
2003	566864010.78
2004	610086948.05
2005	634519741.65
2006	661963472.98
2007	674807017.68
2008	710571434.07
2009	718263334.99
2010	738455772.7799999
2011	764203747.1999999
2012	790509537.9499999
2013	803467577.5999999
2014	806665060.1700001
2015	859837350.9999998
2016	855359432.3799999
2017	864861549.5999999
2018	867749245.5799999
2019	850235685.5700002
2020	852770656.4300001
2021	874001165.8900001
2022	878218639.8900001