Year	metric tons
1960	42800
1961	32100
1962	29000
1963	27600
1964	31900
1965	35700
1966	39700
1967	50200
1968	53100
1969	66500
1970	78901
1971	74106
1972	92112
1973	90814
1974	89591
1975	88423
1976	95038
1977	93876
1978	104306
1979	93244
1980	150030
1981	191240
1982	212936
1983	204166
1984	240149
1985	260791
1986	261619
1987	282460
1988	292151
1989	240639
1990	275047
1991	293259
1992	307033
1993	338662
1994	355986
1995	450925
1996	400368
1997	364899
1998	402990
1999	363241
2000	363639
2001	453468
2002	381288
2003	363734
2004	368929
2005	357231
2006	294399
2007	301472
2008	279686.5
2009	346095.68
2010	394931.3
2011	287721.27
2012	341528.86
2013	310148.03
2014	337623.94
2015	304020.53
2016	300099.79
2017	321762.94
2018	288136.86
2019	276357.34
2020	246252.76
2021	276257.85
2022	247552.73