Year	metric tons
1961	411470
1962	418321
1963	449507
1964	381392
1965	455106
1966	434564
1967	429601
1968	480710
1969	503075
1970	478920
1971	510860
1972	491455
1973	498445
1974	516196
1975	592260
1976	631970
1977	557490
1978	557915
1979	595580
1980	625905
1981	766100
1982	700371
1983	496789
1984	865748
1985	972965
1986	839006
1987	865495
1988	834282
1989	845276
1990	792648
1991	902497
1992	952128
1993	1113756
1994	956890
1995	1089553.07
1996	1138597.59
1997	944951.86
1998	1157807.09
1999	1137351
2000	1244321.76
2001	1324781
2002	1315565.21
2003	1462502
2004	1255985
2005	1659795
2006	1865967
2007	1733466
2008	2052972
2009	2378919
2010	2133671
2011	1988006.81
2012	2125542.86
2013	2503244.71
2014	2449241
2015	2934919
2016	2660808
2017	2278993.69
2018	3267425.32
2019	2912082
2020	2914459
2021	3741163.26
2022	2615641.21