Year	metric tons
1960	357201
1961	424517
1962	469200
1963	532001
1964	599811
1965	639833
1966	703234
1967	759881
1968	840723
1969	879124
1970	876609
1971	1067559
1972	1342357
1973	1686127
1974	2024288
1975	2133667
1976	2405159
1977	2422883
1978	2352830
1979	2420659
1980	2408361
1981	2810258
1982	2641382
1983	2791459
1984	2908151
1985	3093816
1986	3660725
1987	3333418
1988	3216014
1989	3327347
1990	3285474
1991	2983447
1992	3304093
1993	3335883
1994	3478501
1995	3359594
1996	3334151
1997	3268001
1998	2837464
1999	2909329
2000	2506078
2001	2677017
2002	2498788
2003	2501632
2004	2542602
2005	2719486
2006	3051622
2007	3287437
2008	3365700
2009	3203623
2010	3112233
2011	3256528.59
2012	3182945.63
2013	3138753.2199999997
2014	3319374.5
2015	3334490.13
2016	3230567.3899999997
2017	3694266.23
2018	3681843.76
2019	3824685.84
2020	3710381.41
2021	3742566.29