Year	metric tons
1961	1584920
1962	1657700
1963	1670300
1964	1784510
1965	1714600
1966	1746795
1967	1855015
1968	1940490
1969	1989965
1970	2056645
1971	2008805
1972	2032600
1973	2021780
1974	2133205
1975	2094080
1976	2178985
1977	2189893
1978	2038310
1979	2162612
1980	2237803
1981	2133725
1982	2084520
1983	2280960
1984	2273900
1985	2319560
1986	2385058
1987	2337849
1988	2307600
1989	2544675
1990	2581217
1991	2497183.9
1992	2590967.09
1993	2723977.31
1994	2517000
1995	2641973.75
1996	2684976.82
1997	2741980.17
1998	2609983.93
1999	2755988.21
2000	2660170
2001	2853015
2002	2786948.94
2003	3127724.54
2004	3389544.49
2005	3794599.2
2006	3904369.54
2007	4024722
2008	4355509
2009	4975572.69
2010	5159720.58
2011	4739751.99
2012	5009947
2013	3997774
2014	4350378.47
2015	4057987.42
2016	4138500.16
2017	3888315.15
2018	4251342.81
2019	4136202.73
2020	4455179.51
2021	4625795.26
2022	4803368.83