Year	metric tons
1961	1106550
1962	1168200
1963	1058200
1964	947700
1965	991700
1966	1053013
1967	1153900
1968	1013900
1969	1179058
1970	991241
1971	983742
1972	817000
1973	890000
1974	1154000
1975	1306628
1976	1183620
1977	1075000
1978	1212502
1979	1081330
1980	967911
1981	1197000
1982	1281686
1983	1481621
1984	1113368
1985	1724909
1986	1727744
1987	1639653
1988	2196345
1989	2156710
1990	1771419
1991	2414210
1992	1809361.52
1993	2227998
1994	2457451
1995	2188973.04
1996	2219312
1997	2137259
1998	2548018.77
1999	2893716.36
2000	2310195.56
2001	2584032.84
2002	2518353.98
2003	3409360.22
2004	2845019.68
2005	3398743.19
2006	3693356.99
2007	3885587
2008	4814995.53
2009	6057353.9
2010	5338937.19
2011	5777865.09
2012	6555027
2013	6993980
2014	6980884.5
2015	8055051.84
2016	8849709.99
2017	9296131.69
2018	10159697.35
2019	10451432.52
2020	10352055.35
2021	8819409.67
2022	10289005.99