Year	metric tons
1960	231420
1961	316340
1962	351160
1963	430905
1964	590050
1965	629865
1966	722092
1967	861366
1968	1102121
1969	1285154
1970	1437837
1971	1587432
1972	1679152
1973	1679559
1974	1516024
1975	1548924
1976	1661315
1977	2191381
1978	2101681
1979	1954258
1980	1799988
1981	1990460
1982	2121455
1983	2261922
1984	2140261
1985	2233375
1986	2541990
1987	2785311
1988	2652089
1989	2704781
1990	2789953
1991	2972104
1992	3246490
1993	3385003
1994	3524996
1995	3590578
1996	3570116
1997	3442715
1998	3524933
1999	3646070
2000	3735279
2001	3648095
2002	3797036
2003	3914076
2004	4099653
2005	4118527
2006	4053100
2007	3675407
2008	3204293
2009	3287370
2010	3096742
2011	3037130.58
2012	3000347.0700000003
2013	2829925.5
2014	2575131.63
2015	2423176.08
2016	2495764.87
2017	2388032.35
2018	2458068.89
2019	2490448.92
2020	2600397.33
2021	2405437.6
2022	2386672.33