Year	metric tons
1961	104992
1962	124400
1963	128400
1964	118200
1965	155601
1966	159615
1967	174883
1968	152963
1969	205174
1970	82458
1971	50804
1972	160131
1973	274089
1974	186860
1975	270184
1976	332909
1977	110732
1978	299221
1979	213486
1980	214831
1981	247730
1982	292800
1983	417587
1984	275134
1985	234575
1986	284850
1987	275970
1988	283231
1989	321878
1990	272536
1991	257988.97
1992	218124.02
1993	180161.03
1994	165154.92
1995	146510.94
1996	159800
1997	206200
1998	212700
1999	212700
2000	221780
2001	217800
2002	217100
2003	216700
2004	218465
2005	233600
2006	213470
2007	213770
2008	213200
2009	215350
2010	243539.07
2011	275210
2012	308472.65
2013	305900
2014	304363.03
2015	254599.99
2016	299287.67
2017	209512.43
2018	279550
2019	219613
2020	209411
2021	209777.18
2022	209956.99