Year	metric tons
1961	17227295
1962	23977648
1963	23217742
1964	22230266
1965	24267873
1966	21355812
1967	24292823
1968	29293787
1969	26136174
1970	25573799
1971	25686222
1972	31304697
1973	24601472
1974	28400997
1975	30050942
1976	33559002
1977	25354550
1978	29912896
1979	28401453
1980	32453183
1981	30188097
1982	32785916
1983	30734490
1984	29800448
1985	38336142
1986	40948808
1987	38527909
1988	44267945
1989	40524487
1990	48623976.28
1991	55118908.33
1992	52817792.900000006
1993	53160529.81
1994	57457509.949999996
1995	50737423.690000005
1996	62828348.52999999
1997	50088958.199999996
1998	59781442.67
1999	49873177.65999999
2000	44991140.99
2001	53185432.93
2002	62205174.57000001
2003	70180973.61
2004	70709800.65
2005	68111717.58
2006	74647924.88
2007	67379417.25
2008	52827204.50000001
2009	69421195.38000001
2010	63829901.77000001
2011	64553133.09
2012	64728724.16999999
2013	70184207.15
2014	66715588.05
2015	69098091.33000001
2016	63627888.38999999
2017	65233288.63
2018	61025972.07
2019	73130574.88
2020	64657022.22
2021	63346714.67999999
2022	56830552.650000006