Year	metric tons
1960	1688890.01
1961	1548664
1962	1624918
1963	1705767
1964	2064353
1965	2117770
1966	2192218.01
1967	2226761
1968	2422897
1969	2515262
1970	2707175
1971	2836106
1972	2748049
1973	3086442
1974	3359054
1975	3201324
1976	3142416
1977	3337664.99
1978	3369347.01
1979	3418218.01
1980	3518525
1981	3579227
1982	3549997
1983	3779224.5
1984	4155338.1
1985	4186419.6
1986	4398397.890000001
1987	4415094
1988	4685448
1989	5229492
1990	5389694
1991	5766573
1992	6018614.09
1993	6421280.89
1994	6703401.67
1995	6910486.91
1996	7315297.31
1997	7689705.84
1998	7709532.86
1999	8244348.7
2000	8275842.6
2001	8622974
2002	8777070
2003	9006660.2
2004	9282703.4
2005	9710004.96
2006	10348188
2007	10390473
2008	11535767
2009	11772043.68
2010	12587830.14
2011	12228272.91
2012	13514260.12
2013	13756224.14
2014	14660219.41
2015	15131296.5
2016	16046147.629999999
2017	17180704.73
2018	18131907.820000004
2019	19052558.58
2020	18992152.209999997
2021	20256839.87
2022	21712014.059999995