Year	metric tons
1960	960
1961	980
1962	1100
1963	920
1964	4250
1965	5280
1966	4620
1967	7050
1968	6210
1969	6150
1970	6000
1971	5770
1972	5130
1973	5503
1974	6525
1975	7043
1976	7233
1977	9268
1978	9050
1979	11522
1980	13209
1981	14715
1982	17075
1983	16051
1984	17994
1985	14468
1986	17378
1987	18315
1988	19973
1989	18573
1990	18592
1991	16492
1992	233662
1993	220602
1994	174849
1995	154299
1996	140343
1997	158162
1998	171764
1999	191985
2000	208532
2001	205205
2002	217020.76
2003	241938.1
2004	256607.40000000002
2005	293238
2006	294887.05
2007	326737.8
2008	350501.72
2009	363869.56000000006
2010	379809.06000000006
2011	408421.30000000005
2012	456940.25
2013	500777.99
2014	519197.49
2015	524256.59
2016	567258.4199999999
2017	614435.8999999999
2018	683088.5800000001
2019	813520.0599999999
2020	921262.3500000001
2021	1025917.1200000001
2022	1105807.58