Year	metric tons
1960	4628165
1961	6504496
1962	8499409
1963	8585537
1964	11314630
1965	9320757
1966	11434801
1967	12570593
1968	13366648
1969	11701275
1970	15328783
1971	13759326
1972	7383558
1973	5198183
1974	7351087
1975	6561252
1976	8092233
1977	6646830
1978	8782309
1979	9973268
1980	9441392
1981	10258802
1982	11323098
1983	9156810.899999999
1984	11975745.9
1985	13709189.52
1986	15799970.28
1987	13821897.98
1988	16229762.719999999
1989	17719291.900000002
1990	15977252.91
1991	16958099.89
1992	17821951.55
1993	19178340.08
1994	24145837.27
1995	21497006.38
1996	21679980.46
1997	19159642.36
1998	12382957.23
1999	18237572.53
2000	19909256.4
2001	17076260.5
2002	18222823.88
2003	14794939.05
2004	19727519.43
2005	18963471.56
2006	16639075.3
2007	16483444.69
2008	16697988.66
2009	15972500.83
2010	12226355
2011	16594578.820000002
2012	12554264.18
2013	12910261.739999998
2014	11071917.530000001
2015	11689592.790000001
2016	10458810.670000002
2017	11494113.080000002
2018	14514721.76
2019	12116185.579999998
2020	12729907.72
2021	14294607.84
2022	12943545.690000003