Year	metric tons
1960	44300
1961	38600
1962	42500
1963	49700
1964	46300
1965	53500
1966	48200
1967	57500
1968	68900
1969	64890
1970	90970
1971	102530
1972	106840
1973	151565
1974	175470
1975	214198
1976	280638
1977	421954
1978	610399
1979	600266
1980	629977
1981	526740
1982	585911
1983	336156
1984	849180
1985	1056800
1986	959932
1987	610035
1988	800393
1989	611582
1990	288913
1991	330525
1992	226817
1993	286633
1994	330248
1995	508572
1996	702974
1997	536887
1998	322348
1999	503032
2000	596489
2001	587770
2002	319169
2003	399526
2004	356774
2005	464387
2006	469060
2007	408926
2008	505571
2009	498679
2010	399874
2011	508793
2012	501881
2013	509031
2014	656448
2015	632571
2016	709181
2017	623124
2018	597754
2019	608160.22
2020	636338.68
2021	863105.6
2022	688326.27