Year	metric tons
1960	8044825
1961	8460059
1962	8619266
1963	9055794.1
1964	9834731.1
1965	11063136.4
1966	11726667.8
1967	12308386
1968	12160498
1969	11626619
1970	12344735
1971	12474677
1972	12711191
1973	12988080
1974	13154573
1975	12994022
1976	13963438
1977	13931136
1978	13246258.100000001
1979	13123373.700000001
1980	13306337.9
1981	13463841.65
1982	13085405.100000001
1983	13601789.62
1984	14002010.66
1985	13828030.450000001
1986	13643433.129999999
1987	13728730.56
1988	14098887.56
1989	13319190.600000001
1990	12135106.870000001
1991	12134904.850000001
1992	20293257.48
1993	18863670.269999996
1994	18361247.61
1995	19873456.35
1996	20136482.3
1997	20619223.69
1998	19968515.48
1999	19258205.59
2000	19340563.39
2001	19057659.419999998
2002	18441309.6
2003	17732275.040000003
2004	17170419.23
2005	16913615.59
2006	16652006.31
2007	16935447.490000002
2008	16439690.72
2009	16876715.449999996
2010	17422891.459999997
2011	17090645.26
2012	16931376.220000003
2013	17276521.580000002
2014	17620430.71
2015	18218004.41
2016	17741353.699999996
2017	19058974.14
2018	19299255.14
2019	18690121.119999997
2020	18611359.800000004
2021	18755161.369999997
2022	18002738.750000004