Year	metric tons
1960	17100
1961	18000
1962	19500
1963	19900
1964	20100
1965	20000
1966	20500
1967	20500
1968	22000
1969	22300
1970	22200
1971	22200
1972	22200
1973	22600
1974	22600
1975	22600
1976	24700
1977	23570
1978	26610
1979	28520
1980	26060
1981	28530
1982	29710
1983	29500
1984	29780
1985	26290
1986	23942
1987	27200
1988	29200
1989	30200
1990	31500
1991	33113
1992	35023
1993	40014
1994	44013
1995	44003
1996	45009.6
1997	47010
1998	49513
1999	49513.5
2000	53010
2001	58007.5
2002	57007.5
2003	59007.5
2004	63007.5
2005	59007.5
2006	57007.5
2007	65516.5
2008	68602.5
2009	71698
2010	71358
2011	71008
2012	34008
2013	33708
2014	33508
2015	33008
2016	35502
2017	38390
2018	41041
2019	40770
2020	37660
2021	40970
2022	44250