Year	metric tons
1960	4500
1961	4800
1962	5300
1963	5300
1964	5300
1965	6200
1966	6200
1967	6200
1968	6700
1969	6700
1970	7447
1971	7739
1972	7884
1973	12294
1974	12695
1975	12695
1976	12695
1977	18092
1978	14972
1979	11143
1980	13265
1981	14739
1982	9212
1983	11653
1984	11882
1985	10712
1986	13262
1987	14642
1988	13852
1989	19789
1990	21602
1991	24985
1992	18045
1993	21308
1994	22781
1995	23699
1996	31601
1997	32743
1998	29033
1999	32639
2000	29016
2001	34527
2002	37405
2003	37366
2004	32817
2005	34955
2006	37477
2007	43574
2008	42881
2009	45884
2010	46624
2011	41500
2012	36062
2013	43726
2014	51500
2015	55968
2016	58261
2017	60461
2018	49526
2019	56198.66
2020	50989.79
2021	53171.97
2022	53946.5