Year	metric tons
1960	6032792
1961	6338091
1962	6648562
1963	6982073
1964	7408244
1965	7873838
1966	8399488
1967	8698915
1968	9293037
1969	9697979
1970	9740731
1971	10656840
1972	11538083
1973	11719671
1974	12066034
1975	12480804
1976	12893356
1977	14451452
1978	14996662
1979	14551505
1980	14898683
1981	15546243
1982	16521842
1983	17617684.990000002
1984	18601376.14
1985	19962410.099999998
1986	21907990.59
1987	24279104.69
1988	25645517.65
1989	27401870.580000002
1990	28063515.33
1991	30562541.939999998
1992	34853101.58
1993	39588845.53
1994	44547492.1
1995	49684749.16
1996	53700309.35
1997	54332973.92
1998	57342538.75
1999	60425197.49
2000	62672980.83
2001	64395772.25
2002	67378673.97
2003	70547400.58
2004	74731201.03
2005	77956568.83
2006	81296039.94
2007	84438065.75
2008	86987070.19
2009	90469040.22000001
2010	94420166.75
2011	97989195.16
2012	103548817.17999999
2013	110465661.22000001
2014	115199211.08999999
2015	119113304.93000002
2016	122028131.91000001
2017	124549634.3
2018	126161759.10000004
2019	127757552.75000001
2020	128615528.29
2021	129849873.74000001
2022	132464361.14