Year	metric tons
1960	63700
1961	61600
1962	59900
1963	62000
1964	59500
1965	59700
1966	62800
1967	63800
1968	68200
1969	58700
1970	53000
1971	60200
1972	59000
1973	53300
1974	46820
1975	49027
1976	44496
1977	45360
1978	50577
1979	47125
1980	45615
1981	49279
1982	47841
1983	48580
1984	47871
1985	45115
1986	39466
1987	40231
1988	41541
1989	39633
1990	41460
1991	39891
1992	37120
1993	36089
1994	34254
1995	35599
1996	30823
1997	30500
1998	30835
1999	29876
2000	29800
2001	30209
2002	29028
2003	26831
2004	26735
2005	24567
2006	23019
2007	24541
2008	22609
2009	21722
2010	22418
2011	22477
2012	24659
2013	25662
2014	26793
2015	24721
2016	26970
2017	24649
2018	23005
2019	21350
2020	19953.8
2021	17937
2022	18710