Year	metric tons
1960	321171
1961	316902
1962	286516
1963	403757
1964	436791
1965	494801
1966	520086
1967	624752
1968	648700
1969	714897
1970	808712
1971	859450
1972	923011
1973	937990
1974	1065078
1975	1226780
1976	1207424
1977	1126222
1978	1071950
1979	1224377
1980	1376437
1981	1402870
1982	1475269
1983	1673685
1984	1645559.0899999999
1985	1608338.12
1986	1620516.13
1987	1689275.4
1988	1728176.8
1989	1359969.7
1990	1059530.7
1991	1009639
1992	7430762.28
1993	6059928.27
1994	5381230.01
1995	6130010.35
1996	6265048.7
1997	6157744.29
1998	5991149.58
1999	5739591.090000001
2000	5516767.24
2001	5056877.32
2002	4670222.1
2003	4631274.739999999
2004	4352048.03
2005	4537255.09
2006	4682258.279999999
2007	5038917.83
2008	4876107.800000001
2009	5361466.81
2010	5590120.790000001
2011	5800453.830000001
2012	5805539.86
2013	5910900.17
2014	5692684.919999998
2015	6028205.989999999
2016	6279553.57
2017	6565643.220000001
2018	6887651.4
2019	7087170.380000001
2020	7137367.949999999
2021	7273444.809999999
2022	7122499.920000001