Year	metric tons
1960	4628345
1961	6504690
1962	8499620
1963	8585759
1964	11314824
1965	9320962
1966	11435136
1967	12570897
1968	13367002
1969	11701691
1970	15329654
1971	13760386
1972	7384977
1973	5201447
1974	7354968
1975	6567078
1976	8098760
1977	6655870
1978	8794667
1979	9989698
1980	9467457
1981	10293840
1982	11374863
1983	9222396.899999999
1984	12047536.9
1985	13785134.520000001
1986	15891141.28
1987	13951557.98
1988	16392183.719999999
1989	17903339.9
1990	16198383.91
1991	17254802.89
1992	18161746.55
1993	19519098.08
1994	24552748.27
1995	21964672.38
1996	22302376.46
1997	19896876.36
1998	13137493.23
1999	18972041.53
2000	20748725.4
2001	18182210.5
2002	19397244.88
2003	16029669.05
2004	21109716.93
2005	20464121.06
2006	18326529.54
2007	18153648.23
2008	18502076.44
2009	17854065.060000002
2010	14063328.36
2011	18793160.489999995
2012	14918262.979999999
2013	15283275.520000003
2014	13841919.169999998
2015	14336018.740000004
2016	13116803.08
2017	14436052.55
2018	17702362.419999998
2019	15683629.64
2020	16542481.019999998
2021	18122316.76
2022	17188619.119999997