Year	metric tons
1960	2047815
1961	1955924
1962	2031135
1963	2278131
1964	2464211
1965	2664490
1966	2878194
1967	2996726
1968	3172722
1969	3353912
1970	3607571
1971	4058721
1972	4435236
1973	4605380
1974	5054032
1975	5333828
1976	5509795
1977	6501285.5
1978	6862791
1979	6947785
1980	7604596
1981	7986865
1982	8356265
1983	9236086.5
1984	10330971.45
1985	11476765.66
1986	12672370.09
1987	13904999.23
1988	15558958.96
1989	16579954.06
1990	16825216.04
1991	18645991.6
1992	22055703.89
1993	25525588.05
1994	28914260
1995	32364767.2
1996	35097698.129999995
1997	35590712.7
1998	37720436.1
1999	41002604.61000001
2000	43011453.75
2001	45555975.72
2002	48669609.76
2003	51531396.12
2004	55808015.1
2005	59152611.71
2006	62947175.12
2007	66316898.769999996
2008	70214986.72999999
2009	73841788.52
2010	77989014.81
2011	81622319.29999998
2012	88181711.63000003
2013	94951794.95
2014	99622793.35
2015	103989079.95000002
2016	108203706.41000004
2017	112216487.32
2018	115939312.06000002
2019	119719882.84
2020	122759822.81999996
2021	126127136.22000001
2022	126935292.96999997