Year	metric tons
1960	13400
1961	12800
1962	12800
1963	13500
1964	13900
1965	16200
1966	17300
1967	17000
1968	17700
1969	19000
1970	20100
1971	22900
1972	22900
1973	26300
1974	28660
1975	25490
1976	27900
1977	26950
1978	25940
1979	28630
1980	33850
1981	40630
1982	38180
1983	40940
1984	34947
1985	36326
1986	42683
1987	39805
1988	35453
1989	30187
1990	31197
1991	29351
1992	24402
1993	23325
1994	23778
1995	27411
1996	38230
1997	41709
1998	35453
1999	38026
2000	41530
2001	36556
2002	40432
2003	93543
2004	91954
2005	85778
2006	95080
2007	94151
2008	123047
2009	151500
2010	163419
2011	196076.29
2012	211299.71
2013	222822
2014	254202.54
2015	287267.35
2016	300914.88
2017	331356.79
2018	352052.16
2019	403590.35
2020	391089.02
2021	413390.04
2022	461913.54