Year	metric tons
1960	180
1961	194
1962	211
1963	222
1964	194
1965	205
1966	335
1967	324
1968	434
1969	636
1970	1221
1971	1520
1972	1989
1973	3944
1974	4691
1975	6866
1976	7837
1977	10360
1978	14048
1979	18420
1980	28374
1981	38015
1982	55544
1983	69731
1984	76190
1985	80630
1986	95846
1987	135739
1988	168426
1989	190273
1990	229472
1991	305214
1992	351068
1993	353701
1994	423332
1995	490039
1996	658812
1997	773619
1998	794308
1999	774784
2000	872420
2001	1131966
2002	1201982
2003	1262013
2004	1410250.5
2005	1523724.5
2006	1715038.24
2007	1707865.84
2008	1840876.7799999998
2009	1917656.4299999997
2010	1868435.8599999999
2011	2223233.4700000007
2012	2390230
2013	2402647.4000000004
2014	2801352.230000001
2015	2678551.28
2016	2687247.41
2017	2973217.4699999997
2018	3216338
2019	3594503.2600000007
2020	3838618.3000000003
2021	3850501.5199999996
2022	4260570.83