Year	metric tons
1960	885835
1961	887874
1962	931502
1963	942027
1964	998768
1965	1048225
1966	1088644
1967	1103392
1968	1201891
1969	1256472
1970	1316950
1971	1421637
1972	1444345
1973	1524147
1974	1472810
1975	1499712
1976	1582551
1977	1571427
1978	1657827
1979	1722914
1980	1777270
1981	1736321
1982	1691511
1983	1729385.2400000002
1984	1837407.92
1985	1873518.7100000002
1986	2006386.3199999998
1987	2024067.7799999998
1988	2041510.97
1989	2149435.69
1990	2214122.3600000003
1991	2173537.77
1992	2708634.7199999997
1993	2577151.7199999997
1994	2625540.6100000003
1995	3047939.07
1996	2886829.5
1997	3069069.92
1998	3350020.04
1999	3318818.52
2000	3528836.7199999997
2001	3724116.7399999998
2002	3916643.46
2003	4119113.2800000003
2004	4504650.55
2005	4585896.130000001
2006	4568172.86
2007	4633539.83
2008	4627894.71
2009	4777475.02
2010	4823085.140000001
2011	4878523.550000001
2012	5057430.3100000005
2013	5191933.3100000005
2014	5297979.859999999
2015	5246359.600000001
2016	5561299.66
2017	5860310.859999999
2018	5788053.410000001
2019	5787992.779999999
2020	5615069.749999998
2021	5377248.440000001
2022	5089272.909999999