Year	metric tons
1960	1064768
1961	897796
1962	865368
1963	996876
1964	1164529
1965	1313403
1966	1496798
1967	1510712
1968	1528750
1969	1766863
1970	1765549
1971	2105686
1972	2297228
1973	2152143
1974	2347466
1975	2568873
1976	2601013
1977	3357795.5
1978	3579790
1979	3531962
1980	3829812
1981	3813157
1982	4059865
1983	4538474.5
1984	5368051
1985	6186364.21
1986	6890479.1
1987	7872131
1988	9048332
1989	9966177
1990	10011191
1991	11476068
1992	14296785.9
1993	17485660.2
1994	20419102.96
1995	23434863.7
1996	25814475.38
1997	25893942.19
1998	27933910
1999	30468731.84
2000	32516485.66
2001	34342211.62
2002	36703718.85
2003	38824946.06
2004	41665706.410000004
2005	43776055.83
2006	46132609.38
2007	48235772.27999999
2008	50316654.58
2009	52661507.29
2010	54373925.33999999
2011	56047250.29
2012	59579534.09999999
2013	62272597.419999994
2014	64933487.980000004
2015	66958634.49000001
2016	70011050.37
2017	72492030.9
2018	74795841.59000003
2019	77579853.87
2020	80177776.16000003
2021	82597569.73000005
2022	85309840.77000001