Year	metric tons
1960	1498753
1961	1591228
1962	1710381
1963	1753404
1964	1890915
1965	1988552
1966	2060826
1967	2150802
1968	2275227
1969	2392664
1970	2523948
1971	2689261
1972	2932424
1973	2993005
1974	2988078
1975	2906787
1976	2926923
1977	3040467
1978	3054449
1979	3023803
1980	3026376
1981	3070553
1982	3106534
1983	3240549.2399999998
1984	3353016.14
1985	3427391.11
1986	3686807.3200000003
1987	3826939.7800000003
1988	3864487.9699999997
1989	3977763.69
1990	4106598.36
1991	4210310.77
1992	4453483.800000001
1993	4510555.92
1994	4490763.97
1995	4771859.33
1996	4908578.36
1997	5315343.33
1998	5429499.35
1999	6062763.85
2000	6389559.449999999
2001	6793328.87
2002	7050565.06
2003	7686031.92
2004	8402882.8
2005	8714611.48
2006	9123553.95
2007	9383303.69
2008	9565726.54
2009	10196449.299999999
2010	10668882.18
2011	11025373
2012	11553084.310000004
2013	11831064.34
2014	12342785.760000004
2015	12562604.199999997
2016	12980656.700000001
2017	13764269.459999999
2018	14068170.270000003
2019	14403395.199999996
2020	14461051.93
2021	14562824.879999997
2022	14540929.429999998