Year	metric tons
1960	4015150.01
1961	3915083
1962	4175027
1963	4411155
1964	5068240
1965	5139552
1966	5472889.01
1967	5565097
1968	5902048
1969	6243555
1970	6513127
1971	6889592
1972	7414130
1973	7879802
1974	7884635
1975	7584968
1976	7534157
1977	7879405.99
1978	8034762.909999999
1979	8159137.81
1980	8350960.1
1981	8691099.08
1982	8922550.64
1983	9665204.28
1984	10043221.540000001
1985	10253339.58
1986	10844756.4
1987	11138672.91
1988	11667067.020000001
1989	12510772.409999998
1990	13018188.459999999
1991	13575298.419999998
1992	14607886.62
1993	14976871.93
1994	15759788.750000002
1995	16591912.400000002
1996	16889490.769999996
1997	17780816.93
1998	18164174.28
1999	19556811.540000003
2000	20409968.669999998
2001	21552198.56
2002	22056524.03
2003	23113783.799999997
2004	24539032.52
2005	26092021.89
2006	27534433.380000003
2007	28463291.96
2008	30560570.580000002
2009	31410927.04
2010	32991754.279999997
2011	32960502.289999995
2012	35285138.029999994
2013	35998136.57
2014	37718340.85999999
2015	38512433.93
2016	40054539.54
2017	42431635.30999999
2018	44000374.38
2019	45340739.720000006
2020	45406111.839999996
2021	46634442.11999999
2022	47550609.589999996