Year	metric tons
1960	199875
1961	274904
1962	309267
1963	391380
1964	549576
1965	587753
1966	670292
1967	806597
1968	1038448
1969	1212764
1970	1356961
1971	1498048
1972	1626404
1973	1636985
1974	1468140
1975	1468103
1976	1536215
1977	2040523
1978	1970906
1979	1835895
1980	1704022
1981	1861363
1982	2034812
1983	2161944
1984	2028329
1985	2097535
1986	2407927
1987	2633655
1988	2433898
1989	2444590
1990	2498234
1991	2618771
1992	2875516
1993	2927689
1994	3015196
1995	3031074
1996	3013961
1997	2902898
1998	2930354
1999	2952308
2000	2997124
2001	2833974
2002	2842428
2003	2849670
2004	2839669
2005	2814295
2006	2698803
2007	2304951
2008	1873432
2009	1870702
2010	1810620
2011	1835125.15
2012	1727647.07
2013	1831808.5
2014	1676566.77
2015	1502153.08
2016	1532191.87
2017	1493058.35
2018	1536755.76
2019	1527182.38
2020	1588859.33
2021	1414583.6
2022	1385491.33