Year	metric tons
1960	437596
1961	437548
1962	467367
1963	528408
1964	582491
1965	649959
1966	694517
1967	737472
1968	885729
1969	865196
1970	1001552
1971	1017976
1972	1121113
1973	1203416
1974	1260246
1975	1337280
1976	1235403
1977	1343596
1978	1366790
1979	1346656
1980	1382569
1981	1425121
1982	1495962
1983	1663423.4
1984	1602262
1985	1569142.7
1986	1626241.5
1987	1667263.4
1988	1680237.4
1989	1763810.4
1990	1851203
1991	1926482
1992	1923217
1993	1862867
1994	1873627
1995	1888512
1996	1817838
1997	1835682
1998	1869495
1999	1894739
2000	1920017
2001	1961552
2002	2045093
2003	2184208
2004	2235028
2005	2293481
2006	2341380.49
2007	2520508
2008	2550700
2009	2513836
2010	2502872
2011	2220780
2012	2206570.32
2013	2201842.58
2014	2249191.27
2015	2153987
2016	2027025.5
2017	1889154.23
2018	1822063.71
2019	1830848.66
2020	1914918.37
2021	1842066.89
2022	1771247.26