Year	metric tons
1960	4600
1961	5200
1962	5200
1963	6000
1964	7000
1965	6200
1966	5904
1967	5610
1968	5617
1969	5928
1970	6046
1971	7205
1972	8711
1973	10378
1974	11760
1975	12906
1976	16575
1977	20033
1978	23489
1979	27870
1980	32588
1981	37034
1982	42746
1983	46245
1984	52621
1985	67666
1986	74587
1987	79392
1988	88295
1989	93714
1990	95447
1991	88519
1992	97546
1993	84265
1994	94408
1995	112819
1996	134297
1997	130045
1998	192378
1999	271331
2000	393987
2001	417899
2002	466572
2003	551758
2004	604686
2005	685363
2006	754649
2007	825907
2008	885579.91
2009	921730.23
2010	1178757.87
2011	1270172.77
2012	1360284.5
2013	1458271.75
2014	1504453.89
2015	1567474.29
2016	1821836.6900000002
2017	1884355.82
2018	2093151.5199999998
2019	2158685.78
2020	2131293.0900000003
2021	2116108.18
2022	1609896.06