Year	metric tons
1961	864554
1962	899751
1963	780781
1964	967017
1965	950943
1966	1021611
1967	1342764
1968	1168730
1969	1145565
1970	995286
1971	1362665
1972	1451555
1973	1446611
1974	1441544
1975	1177635
1976	1293919
1977	1526407
1978	1542500
1979	1464500
1980	1251500
1981	1307688
1982	1482700
1983	1404504
1984	1457065
1985	1422875
1986	1363545
1987	1255066
1988	1491655
1989	1587917
1990	1413293
1991	1679752
1992	688786
1993	2137147
1994	1107716
1995	1773119
1996	1943377
1997	1474809
1998	1904024
1999	2635519
2000	2631034
2001	1865675
2002	1710577
2003	2143179
2004	1717993
2005	1302379
2006	2786281
2007	3440138
2008	2845840
2009	3807971
2010	3610283
2011	3924971
2012	3832659
2013	3892310
2014	4246674
2015	3001731
2016	2531749
2017	3711454
2018	2925168
2019	3703148
2020	4028211.5
2021	4897640
2022	4024666.24