Year	metric tons
1960	453263
1961	482181
1962	507353
1963	517995
1964	571758
1965	567211
1966	667451
1967	609459
1968	576886
1969	591002
1970	636557
1971	644472
1972	716237
1973	888979
1974	855733
1975	826319
1976	901060
1977	867855
1978	872516.9
1979	916865.7999999999
1980	967571.1
1981	988045.0800000001
1982	988561.64
1983	1108194.24
1984	1147030.8800000001
1985	1233049.9900000002
1986	1368466.55
1987	1357677.05
1988	1528614.65
1989	1450325.3199999998
1990	1505719.06
1991	1555997.55
1992	1543551.81
1993	1642259.32
1994	1858422.47
1995	2009043.68
1996	1794630.81
1997	1996895.51
1998	2013617.7000000002
1999	2161199.98
2000	2420498.93
2001	2749624.4899999998
2002	2667882.4699999997
2003	2747632.22
2004	2792310.4699999997
2005	2925450.11
2006	2914950.44
2007	2900114.7199999997
2008	2999381.5
2009	3239240.0900000003
2010	3353356.97
2011	3218091.63
2012	3559944.2099999995
2013	3745494.91
2014	3880773.62
2015	3910036.9799999995
2016	4216636.79
2017	4300806.83
2018	4701188.86
2019	4905436.74
2020	4979224.2299999995
2021	5205588.830000001
2022	5216473.19