Year	metric tons
1960	761700
1961	914800
1962	947200
1963	939200
1964	1004000
1965	1074800
1966	1241600
1967	1198400
1968	1180000
1969	1234800
1970	1257200
1971	1273302
1972	1296804
1973	1294441
1974	1361942
1975	1376566
1976	1486511
1977	1587817
1978	1668158
1979	1770087
1980	1877956
1981	1946989
1982	2026589
1983	2248468
1984	2313091
1985	2452695
1986	2607764
1987	2742804
1988	2947009
1989	3087137
1990	3243345
1991	3413930
1992	3627251
1993	3919996
1994	4144434
1995	4388520
1996	4648537
1997	4695769
1998	4760318
1999	4893860.5
2000	5152261.6
2001	5412689
2002	5541952
2003	5927292
2004	6208250
2005	6827210
2006	7277661
2007	8179552
2008	8857709
2009	9828602.530000001
2010	11668385.49
2011	13696745.54
2012	15464174.17
2013	19443818.04
2014	20903925.16
2015	22384950.25
2016	22583433.92
2017	23156059.1
2018	23132926.86
2019	22760687.73
2020	21834094.6
2021	21718023.23
2022	22032424.56