Year	metric tons
1960	5728366
1961	5990704
1962	6294006
1963	6608044
1964	7035934
1965	7474795
1966	7969747
1967	8237325
1968	8803919
1969	9196235
1970	9284088
1971	10140807
1972	10964920
1973	11122314
1974	11372996
1975	11743316
1976	12070587
1977	13613008
1978	13792786
1979	13339674
1980	13698524
1981	14096029
1982	14994065
1983	16329441.99
1984	17154726.14
1985	18477660.1
1986	20280040.590000004
1987	22245274.689999998
1988	23823687.65
1989	25435050.58
1990	26685695.33
1991	29235731.939999998
1992	33390478.580000002
1993	38061947.53
1994	43358992.1
1995	48619829.16
1996	52665169.35000001
1997	53607630.92
1998	56633458.75
1999	59724097.49
2000	61992810.830000006
2001	63681537.65
2002	66665920.96999999
2003	69834647.58
2004	74018396.03
2005	77243723.83
2006	80583230.74000001
2007	83725235.75
2008	86273995.19
2009	89753910.22000001
2010	93693470.75
2011	97260650.16
2012	102824936.17999999
2013	109745249.32000001
2014	114405936.38999997
2015	118325825.23000002
2016	121199652.21000001
2017	123716144.60000001
2018	125284154.60000004
2019	126906318.05000001
2020	127825616.78999998
2021	129081653.24000001
2022	132571111.63999999