Year	metric tons
1960	4196823
1961	5976265
1962	7761307
1963	7714873
1964	10012959
1965	8441357
1966	9854673
1967	11341749
1968	11810963
1969	10465302
1970	13981956
1971	12117408
1972	6437187
1973	4336719
1974	6067458
1975	5415155
1976	6457803
1977	4979046
1978	6577147
1979	6961364
1980	6196541
1981	6442479
1982	7232884
1983	4669320.9
1984	7001545.199999999
1985	8274222.42
1986	9821046.58
1987	8583704.58
1988	10683719.82
1989	10778417.8
1990	10350593.71
1991	10553314.49
1992	10954224.35
1993	12662618.379999999
1994	15808030.67
1995	13272138.58
1996	14347061.26
1997	12790417.86
1998	8475073.33
1999	12771554.629999999
2000	15094959.4
2001	12655949.5
2002	13357618.879999999
2003	10610711.05
2004	14137243.43
2005	14141481.51
2006	12269194.54
2007	12507519.43
2008	13034042.15
2009	12495327.950000001
2010	9773595.43
2011	13821321.26
2012	10286915.669999998
2013	11395908.709999999
2014	9464197.74
2015	10555479.430000002
2016	9618862.999999998
2017	10272660.510000002
2018	13550865.63
2019	11339780.73
2020	12321522.23
2021	13704430.49
2022	12682730.430000002