Year	metric tons
1960	355378
1961	377196
1962	388568
1963	395210
1964	450171
1965	438325
1966	532065
1967	470574
1968	438805
1969	451418
1970	477023
1971	456541
1972	500180
1973	647139
1974	620233
1975	570463
1976	652057
1977	642247
1978	663772.9
1979	733672.7999999999
1980	788076.1
1981	823275.0800000001
1982	859521.64
1983	958297.2400000001
1984	1000339.8800000001
1985	1089847.99
1986	1259917.55
1987	1258550.0499999998
1988	1412698.6500000001
1989	1400398.3199999998
1990	1467270.06
1991	1529456.55
1992	1559588.81
1993	1665617.32
1994	1843723.47
1995	2014605.68
1996	1821640.21
1997	2034808.51
1998	2059551.7000000002
1999	2217615.48
2000	2481221.9299999997
2001	2770205.9899999998
2002	2680435.9699999997
2003	2794444.72
2004	2845313.57
2005	3034655.61
2006	3061273.94
2007	3022695.82
2008	3133779.79
2009	3397777.8400000003
2010	3581370.7800000003
2011	3536333.21
2012	3964676.4999999995
2013	4184510.9300000006
2014	4362367.3100000005
2015	4377779.13
2016	4751410.8100000005
2017	4857899.020000001
2018	5118734.04
2019	5298186.140000001
2020	5135869.739999998
2021	5194415.5200000005
2022	4112555.65