Year	metric tons
1960	49317
1961	50679
1962	52084
1963	53558
1964	55078
1965	58352
1966	58302
1967	60040
1968	60115
1969	63811
1970	65936
1971	69571
1972	70404
1973	72811
1974	73526
1975	76329
1976	80750
1977	81625
1978	87888
1979	93339
1980	98279
1981	105493
1982	112074
1983	119464
1984	131810
1985	144991
1986	170519
1987	193997
1988	209082
1989	222455
1990	250071
1991	294773
1992	332409
1993	365932
1994	415599
1995	497785
1996	581897
1997	697937
1998	796719
1999	831639
2000	940080
2001	1067185
2002	1257288
2003	1394826
2004	1594395.2
2005	1686188.95
2006	1830019.8
2007	1934869.8
2008	2093434.2
2009	2284983.000000001
2010	2675078.84
2011	2916596.5900000003
2012	3256986.7999999993
2013	3453406.149999999
2014	3675719.41
2015	3899727.8200000003
2016	4046394.15
2017	4271317.93
2018	4500411.27
2019	4586641.179999999
2020	4897577.54
2021	5037773.5600000005
2022	5080315.969999999