Year	metric tons
1960	80
1961	110
1962	140
1963	180
1964	230
1965	290
1966	350
1967	430
1968	520
1969	620
1970	730
1971	860
1972	1000
1973	1160
1974	1330
1975	1520
1976	1730
1977	1970
1978	2220
1979	2500
1980	2790
1981	3120
1982	3460
1983	3840
1984	3951
1985	5054
1986	5805
1987	5493
1988	5673
1989	6947
1990	7087
1991	8822
1992	25954
1993	51676
1994	64584
1995	71700
1996	71508
1997	82740
1998	81968
1999	91114
2000	98912
2001	121266
2002	190120
2003	252010
2004	400360
2005	485220
2006	574990
2007	604660
2008	675064
2009	779296.4
2010	852791
2011	819156.4
2012	888369
2013	930780
2014	964255.83
2015	999630.03
2016	1017614.34
2017	1048692.01
2018	1131570.45
2019	1082198.64
2020	1144813
2021	1167356.69
2022	1197078