Year	metric tons
1960	2600
1961	2700
1962	3000
1963	2500
1964	2500
1965	1900
1966	2100
1967	2000
1968	2100
1969	2300
1970	2300
1971	2200
1972	2400
1973	2600
1974	2386
1975	2169
1976	2828
1977	2705.5
1978	2994
1979	2486
1980	2747
1981	2691
1982	2671
1983	2295.5
1984	2889
1985	2448.21
1986	2361.1
1987	2310
1988	2860
1989	3233
1990	4304
1991	4072
1992	3846
1993	8386.17
1994	9134.96
1995	9440.7
1996	10227.38
1997	12328.32
1998	13029
1999	13272.82
2000	14704.98
2001	16121.62
2002	16631.739999999998
2003	15617.06
2004	14206.81
2005	14550.83
2006	15261.1
2007	15432.19
2008	14229.69
2009	15279.34
2010	15228.17
2011	15720.53
2012	16997.74
2013	17201.579999999998
2014	17364.36
2015	16019.9
2016	14156.59
2017	14123.630000000001
2018	14896.740000000002
2019	15140.43
2020	13649.43
2021	14800.69
2022	13335.48