Year	metric tons
1961	20318660
1962	20635150
1963	19470310
1964	19079380
1965	18925506
1966	18915600
1967	21023600
1968	20998210
1969	19912510
1970	17661810
1971	15205810
1972	16168610
1973	16287820
1974	16511820
1975	17624830
1976	15712220
1977	17495960
1978	16483170
1979	15938870
1980	13191708
1981	13824230
1982	14000333
1983	14059961
1984	16012384
1985	15856023
1986	15805100
1987	14526600
1988	13866800
1989	14317700
1990	14449107
1991	13069924.88
1992	14285806.7
1993	10737390
1994	15787203.37
1995	14121766.07
1996	13668044.47
1997	13319770
1998	11933530
1999	12282680
2000	12796066.71
2001	12254842.67
2002	12184519.33
2003	10824201.51
2004	11993783.7
2005	12433769.16
2006	11741858.54
2007	12024848.13
2008	12151091.21
2009	11461384.89
2010	11454614.23
2011	11657491.61
2012	12166480.7
2013	12264625.46
2014	12285001.04
2015	12141378.23
2016	11924734.91
2017	11903650.57
2018	11575323.38
2019	11843136.29
2020	11685523.57
2021	11898822.25
2022	11631439.58