Year	metric tons
1960	5236
1961	6287
1962	7556
1963	9229
1964	11410
1965	14143
1966	17841
1967	24690
1968	40219
1969	55908
1970	71811
1971	88203
1972	105338
1973	123537
1974	143220
1975	165709
1976	193155
1977	223907
1978	258449
1979	298522
1980	348206
1981	405637
1982	472622
1983	551530
1984	697950
1985	749009
1986	859339
1987	1083634
1988	1094736
1989	1204513
1990	904999
1991	955219
1992	1109984
1993	1139135
1994	827215
1995	751816
1996	796753
1997	506834
1998	497381
1999	498423
2000	487791
2001	530780
2002	539282
2003	544786
2004	540805
2005	547337.15
2006	575816.2
2007	593564.7
2008	594881.25
2009	615174.4
2010	638256.6000000001
2011	628453.7299999999
2012	643101.88
2013	648843.75
2014	721520.06
2015	737892.9099999999
2016	798285.59
2017	811456.4
2018	843080.06
2019	846484.76
2020	874866.0499999999
2021	900730.56
2022	188256.6