Year	metric tons
1960	1898122
1961	2067554
1962	2217186
1963	2345934
1964	2605463
1965	2680402
1966	2856979
1967	3223096
1968	3709337
1969	3692920
1970	3162705
1971	3231315
1972	3588634
1973	3730489
1974	3725945
1975	3470926
1976	3167011
1977	3101570
1978	3139679
1979	3055953
1980	2851806
1981	2940661
1982	2923840
1983	3130598
1984	2997726
1985	3023806
1986	3253706
1987	4030762
1988	3917634
1989	3565136
1990	3646909.04
1991	3408673.1
1992	4270778
1993	4181715
1994	3953294
1995	4128554.74
1996	4135236.95
1997	4283852.66
1998	4480498.48
1999	4682214.9399999995
2000	4886562.91
2001	4946875.82
2002	4966005.83
2003	5243949.5
2004	5500721.970000001
2005	5445708.39
2006	5066988.49
2007	5181038.51
2008	5260997.640000001
2009	5244765
2010	5584091.640000001
2011	5854315.2299999995
2012	6266176.07
2013	6125065.660000001
2014	6421076.56
2015	6464838.54
2016	6855978.19
2017	7593294.759999999
2018	7672648.860000001
2019	7409374.449999999
2020	7196310.49
2021	7657118.7299999995
2022	7474090.800000001