Year	metric tons
1960	13700
1961	14400
1962	13700
1963	13500
1964	14010
1965	13850
1966	14300
1967	17900
1968	14400
1969	15400
1970	18850
1971	22000
1972	28710
1973	27850
1974	33544
1975	32316
1976	37373
1977	35142
1978	35330
1979	34551
1980	34676
1981	39016
1982	43661
1983	32217
1984	45116
1985	42414
1986	47544
1987	40183
1988	50680
1989	47260
1990	34950
1991	29530
1992	24620
1993	21100
1994	20400
1995	19830
1996	13900
1997	11168
1998	9614
1999	8998
2000	9727
2001	10818
2002	9248
2003	9042
2004	8137
2005	7284
2006	8088
2007	10312
2008	12532
2009	13131
2010	8981.32
2011	8353.26
2012	10004
2013	10146
2014	10679.98
2015	11041.75
2016	12574.03
2017	12798.2
2018	12298.45
2019	12847.78
2020	12200
2021	11714
2022	11210.78