Year	metric tons
1960	1730060
1961	1823244
1962	1961398
1963	2021727
1964	2195583
1965	2321389
1966	2445738
1967	2545447
1968	2678141
1969	2813723
1970	2994338
1971	3254138
1972	3533246
1973	3624634
1974	3596072
1975	3514355
1976	3584343
1977	3732805
1978	3795565
1979	3789690
1980	3778333
1981	3875995
1982	3933064
1983	4125564.2399999998
1984	4253007.140000001
1985	4360790.109999999
1986	4677859.720000001
1987	4839950.28
1988	4928229.970000001
1989	5081484.99
1990	5319403.170000001
1991	5397570.25
1992	5696605.899999999
1993	5778443.640000001
1994	5743242.279999999
1995	6110094.73
1996	6227566.159999999
1997	6745071.42
1998	7020089.09
1999	7734963.629999999
2000	8068220.739999999
2001	8451465.07
2002	8759887.8
2003	9346622.28
2004	10208341.4
2005	10567769.44
2006	11149863.889999999
2007	11325476.23
2008	11648525.09
2009	12312227.410000002
2010	12880830.530000001
2011	13356721.89
2012	13970348.9
2013	14387054.95
2014	15057692.05
2015	15192828.05
2016	15717419.26
2017	16780847.040000003
2018	17000937.419999998
2019	17225501.03
2020	17161287.149999995
2021	17292435.440000005
2022	17310911.91