Year	metric tons
1960	80639
1961	86172
1962	89263
1963	88224
1964	93148
1965	93898
1966	104339
1967	112101
1968	104175
1969	105690
1970	108706
1971	114121
1972	118952
1973	129830
1974	136244
1975	149633
1976	156744
1977	173780
1978	189266
1979	202202
1980	225296
1981	269959
1982	273541
1983	303941
1984	330764
1985	359626
1986	411552
1987	456727
1988	499597
1989	527897
1990	599824
1991	607507
1992	645368
1993	710414
1994	703522
1995	743092
1996	881098
1997	777547
1998	747007
1999	882989
2000	993727
2001	1076749
2002	1137151
2003	1228559
2004	1468612
2005	2124093
2006	2479247
2007	3137376
2008	3854944
2009	4712846.53
2010	6277924.49
2011	7937071.54
2012	9599764.82
2013	13301407.93
2014	14375286.83
2015	15649311.1
2016	16002319.09
2017	16118238
2018	15771806
2019	15425627.33
2020	14845014.41
2021	14493522.61
2022	14633869.09