Year	metric tons
1960	459097
1961	487021
1962	512290
1963	519744
1964	572091
1965	571453
1966	678673
1967	622478
1968	592916
1969	600325
1970	651290
1971	659696
1972	727052
1973	896400
1974	909226
1975	878710
1976	953008
1977	918022
1978	915669.9
1979	952457.7999999999
1980	979765.1
1981	996027.0800000001
1982	1038968.64
1983	1158072.24
1984	1197100.88
1985	1276794.9900000002
1986	1438603.55
1987	1482517.0499999998
1988	1660384.65
1989	1598657.3199999998
1990	1655711.06
1991	1714337.55
1992	1742229.81
1993	1865434.32
1994	2058311.47
1995	2226655.68
1996	2006925.21
1997	2220955.51
1998	2174005.7
1999	2253296.48
2000	2398342.9299999997
2001	2684821.9899999998
2002	2544543.9699999997
2003	2568550.72
2004	2590374.57
2005	2693411.61
2006	2666575.94
2007	2554420.82
2008	2587138.88
2009	2822146.61
2010	2743914.91
2011	2598961.4399999995
2012	2985856.1299999994
2013	3121398.95
2014	3258848.92
2015	3255229.08
2016	3405556.09
2017	3512074.37
2018	3756044.7199999997
2019	3906087.33
2020	3974320.7299999995
2021	4185857.67
2022	3433856.33