Year	metric tons
1960	14900
1961	19300
1962	21000
1963	22000
1964	22700
1965	24800
1966	26600
1967	28200
1968	29900
1969	27800
1970	26000
1971	25800
1972	28900
1973	29100
1974	30159
1975	30788
1976	31855
1977	34661
1978	32589
1979	32838
1980	33733
1981	39319
1982	42152
1983	44037
1984	39177
1985	36927
1986	36062
1987	36759
1988	38294
1989	35517
1990	33834
1991	22879
1992	22908
1993	17378
1994	18206
1995	16674
1996	15686
1997	16740
1998	17487
1999	19461
2000	19987
2001	19694
2002	18324
2003	18406
2004	19986
2005	21270
2006	22229
2007	22888
2008	23081
2009	21191
2010	20461
2011	22632
2012	21850
2013	21390
2014	22789
2015	23263
2016	21338.97
2017	23893.5
2018	23101.3
2019	22119.31
2020	23856.43
2021	22447.27
2022	23544.789999999997