Year	metric tons
1961	13933400
1962	14433210
1963	13324660
1964	14007520
1965	14531270
1966	14377630
1967	15165050
1968	15047330
1969	15848360
1970	16153080
1971	16341770
1972	15616689
1973	15746610
1974	16640396
1975	16921900
1976	16495300
1977	14409200
1978	17662800
1979	17621700
1980	17995200
1981	18457268
1982	18337400
1983	18081100
1984	19927800
1985	18028600
1986	18697900
1987	18399800
1988	17400000
1989	17132670
1990	17410540
1991	19219130
1992	19890867
1993	19771428
1994	19186472
1995	19679024
1996	20899946
1997	19916519
1998	20731020
1999	21067676
2000	20660952
2001	19933158
2002	21248429
2003	17864361
2004	23283207
2005	21423171
2006	20206559
2007	20350618
2008	21613374
2009	17705746
2010	18502904
2011	19521138.3
2012	18594125.5
2013	18214664
2014	19396843.8
2015	17694873.4
2016	18219221
2017	16251718
2018	16548350
2019	16363450
2020	16945440
2021	16568150
2022	14300570