Year	metric tons
1960	4196723
1961	5976151
1962	7761186
1963	7714751
1964	10012875
1965	8441272
1966	9854568
1967	11341571
1968	11810717
1969	10464882
1970	13980938
1971	12116130
1972	6435501
1973	4333220
1974	6063311
1975	5408968
1976	6450864
1977	4969737
1978	6564464
1979	6944815
1980	6170707
1981	6407922
1982	7183976
1983	4603391.9
1984	6936313.199999999
1985	8204831.42
1986	9739120.58
1987	8466336.58
1988	10552826.82
1989	10644389.8
1990	10195887.71
1991	10358678.49
1992	10725752.35
1993	12452139.379999999
1994	15579266.67
1995	12999954.58
1996	14024158.26
1997	12408403.86
1998	8059764.33
1999	12316416.63
2000	14663770.4
2001	12176476.5
2002	12795752.879999999
2003	9979000.05
2004	13455356.43
2005	13385259.51
2006	11419707.3
2007	11635566.49
2008	12091580.66
2009	11480900.83
2010	8643859
2011	12599582.899999999
2012	9006551.41
2013	10074966.49
2014	7932243.3
2015	8963867.979999999
2016	8017046.44
2017	8556954.2
2018	11657007.430000002
2019	9194004.709999999
2020	10032958.16
2021	11358169.740000004
2022	9959339.610000001