Year	metric tons
1960	488505
1961	513837
1962	560769
1963	582503
1964	646740
1965	680876
1966	740412
1967	790821
1968	782152
1969	850772
1970	961442
1971	1133279
1972	1201113
1973	1196753
1974	1236678
1975	1274753
1976	1262290
1977	1294795
1978	1307225
1979	1296502
1980	1276821
1981	1313217
1982	1303150
1983	1367361
1984	1339388
1985	1357186
1986	1475547
1987	1550668
1988	1522725
1989	1603515
1990	1681864.04
1991	1596435.1
1992	1767671
1993	1672261
1994	1637856
1995	1862551
1996	2066403
1997	2114588
1998	2144828
1999	2253588
2000	2247133
2001	2290269
2002	2231496
2003	2433204
2004	2500809.4
2005	2545151.89
2006	2395130.99
2007	2398153.01
2008	2545543.14
2009	2617164
2010	2736354.6399999997
2011	2985575.9
2012	3112163.08
2013	3172750.2699999996
2014	3221724.89
2015	3158418.75
2016	3474020.35
2017	4126427.18
2018	4216341.62
2019	4015869.9099999997
2020	3844293.23
2021	4064101.9299999997
2022	4245216.5