Year	metric tons
1960	3836623.01
1961	3728664
1962	3979607
1963	4204150
1964	4848198
1965	4907514
1966	5231640.01
1967	5314155
1968	5611986
1969	5942303
1970	6198641
1971	6558221
1972	7036107
1973	7469485
1974	7432548
1975	7101746
1976	7005569
1977	7302135.99
1978	7357337.909999999
1979	7381484.81
1980	7447639.1
1981	7748798.08
1982	7860165.640000001
1983	8497024.28
1984	8755340.54
1985	8857721.58
1986	9402134.4
1987	9472414.91
1988	9809473.020000001
1989	10459603.41
1990	10893698.46
1991	11168584.419999998
1992	11857487.62
1993	12103826.93
1994	12517679.750000002
1995	13009696.400000002
1996	13131089.769999998
1997	13811149.93
1998	13986435.28
1999	14916874.539999997
2000	15601398.67
2001	16189482.56
2002	16162525.270000001
2003	16574873.7
2004	16793038.119999997
2005	17613318.12
2006	18041768.779999997
2007	18370309.36
2008	18860018.23
2009	19425338.93
2010	20212213.669999998
2011	19751058.11
2012	20976216.82
2013	21071802.219999995
2014	21975838.33
2015	21926568.359999992
2016	22985204.269999996
2017	24467886.49
2018	24267167.799999997
2019	24260907.33
2020	23053477.98
2021	23481457.229999993
2022	23504541.769999996