Year	metric tons
1960	1405980
1961	1550110
1962	1652760
1963	1759894
1964	1954936
1965	1995508
1966	2113162
1967	2428660
1968	2922967
1969	2837906
1970	2196442
1971	2092187
1972	2381215
1973	2526942
1974	2482344
1975	2184637
1976	1895201
1977	1795297
1978	1822603
1979	1745723
1980	1556993
1981	1613758
1982	1605707
1983	1744106
1984	1630280
1985	1642635
1986	1754415
1987	2454799
1988	2369360
1989	1936135
1990	1949101
1991	1817819
1992	2503746
1993	2502910
1994	2312736
1995	2275927.74
1996	2090230.9500000002
1997	2197347.66
1998	2379419.48
1999	2475908.94
2000	2705397.91
2001	2771821.82
2002	2901433.83
2003	2990198.5
2004	3166518.57
2005	3087412.65
2006	2869256.2
2007	2978145.7
2008	2932263.35
2009	2851098.95
2010	3111465.7399999998
2011	3160753.0900000003
2012	3479668.62
2013	3252736.17
2014	3576765.26
2015	3757321.2399999998
2016	3792847.8800000004
2017	3897511.9000000004
2018	3883753.45
2019	3821770.86
2020	3805060.9899999998
2021	4097350.48
2022	3725334.1199999996