Year	metric tons
1960	1280335
1961	1125361
1962	1104553
1963	1240365
1964	1421680
1965	1581868
1966	1778862
1967	1803227
1968	1839617
1969	2076190
1970	2078693
1971	2427173
1972	2617597
1973	2496732
1974	2725285
1975	2958880
1976	3008185
1977	3806157
1978	4118204
1979	4131950
1980	4528860
1981	4570392
1982	4875054
1983	5456699
1984	6229012
1985	7138744
1986	7849158
1987	8900364
1988	10251153
1989	11245261
1990	11724565
1991	13426610
1992	16492720.9
1993	19787162.03
1994	23197534
1995	26621034
1996	29269943
1997	29730685
1998	31993347
1999	35123495.019999996
2000	37188882
2001	39329600
2002	42230541.76
2003	44955231.1
2004	49031604.099999994
2005	52370497.269999996
2006	55725407.88
2007	58765849.64
2008	62765220.49999999
2009	66244023.339999996
2010	70522620.33999999
2011	73994289.55
2012	80035547.11999999
2013	86942886.16000001
2014	91196235.89999999
2015	95466404.82000001
2016	99471765.58
2017	102787937.78999999
2018	106378627.6
2019	109838278.72999999
2020	112819341.64999998
2021	115811849.53000002
2022	120044559.43999998