Year	metric tons
1960	1876490
1961	2044120
1962	2192890
1963	2321944
1964	2581406
1965	2654288
1966	2829662
1967	3192056
1968	3671573
1969	3649337
1970	3112317
1971	3170756
1972	3550562
1973	3695280
1974	3680234
1975	3430599
1976	3129059
1977	3057943
1978	3094360
1979	3023918
1980	2818804
1981	2875074
1982	2859819
1983	3037485
1984	2919819
1985	2942477
1986	3159920
1987	3924173
1988	3826276
1989	3490593
1990	3573390.04
1991	3363182.1
1992	4224017
1993	4134476
1994	3913286
1995	4100575.74
1996	4115092.95
1997	4263504.66
1998	4449983.48
1999	4651886.9399999995
2000	4871014.91
2001	4954512.82
2002	5016139.83
2003	5258147.5
2004	5444253.97
2005	5388494.54
2006	5189578.19
2007	5245791.71
2008	5435761.49
2009	5416393.949999999
2010	5788678.979999999
2011	6022912.86
2012	6443639.5
2013	6359291.289999999
2014	6783813.149999999
2015	6889789.150000001
2016	7036351.859999999
2017	7604078.34
2018	7525897.0600000005
2019	7489397.559999999
2020	7328226.869999998
2021	7798974.67
2022	7619989.52