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	7145
1972	8556
1973	10067
1974	10873
1975	11396
1976	13900
1977	16233
1978	18554
1979	20830
1980	23325
1981	25837
1982	29390
1983	30877
1984	34269
1985	49929
1986	53736
1987	54769
1988	62285
1989	69066
1990	70522
1991	70649
1992	78320
1993	65086
1994	70944
1995	87973
1996	109249
1997	105662
1998	165476
1999	246418
2000	360829
2001	364763
2002	398297
2003	476490
2004	514596.4
2005	590726
2006	643697
2007	688843.4
2008	756787.12
2009	771178.48
2010	987772.0599999999
2011	1041917.1900000001
2012	1084942.22
2013	1150204.75
2014	1215588.9899999998
2015	1259594.29
2016	1472670.96
2017	1539062.07
2018	1739378.6199999996
2019	1789937.4200000002
2020	1764585.2800000003
2021	1765853.6799999997
2022	1746351.57