Year	metric tons
1960	200744
1961	210986
1962	221087
1963	232702
1964	245339
1965	259445
1966	270514
1967	284007
1968	329697
1969	346887
1970	367117
1971	394265
1972	418392
1973	448093
1974	501110
1975	523098
1976	568461
1977	622171
1978	726817
1979	811065
1980	934314
1981	1011344
1982	1129945
1983	1263041
1984	1359779
1985	1476152
1986	1532860
1987	1768640
1988	1950299
1989	2142148
1990	2206092
1991	2488830
1992	2831844
1993	2948564
1994	3314002
1995	3656280
1996	3839662
1997	4060596
1998	4292610
1999	4761156
2000	4939954
2001	5519165
2002	6066390.76
2003	6755100.1
2004	8033360.4
2005	8800452.77
2006	9674388.6
2007	10336453.6
2008	11924463.350000001
2009	12253082.11
2010	13125752.61
2011	13627567.23
2012	14792553.540000001
2013	15368355.76
2014	16142446.82
2015	17014920.07
2016	17713201.450000003
2017	18787403.47
2018	20722819.299999997
2019	21826008.71
2020	23059856.34
2021	23943455.55
2022	24854207.819999997