Year	kilograms per hectare of arable land
1961	0.08250276854928018
1962	0.23864894795127353
1963	0.3474669603524229
1964	0.5658914728682171
1965	0.6140642303433002
1966	1.8826135105204873
1967	1.4568444200109951
1968	1.6871907641561297
1969	2.4766355140186915
1970	2.743983614951357
1971	4.0798771121351765
1972	5.165936739659368
1973	5.715011547344111
1974	5.823853211009174
1975	5.585421412300684
1976	6.7316742081447964
1977	7.850337078651686
1978	8.278125
1979	9.292239467849225
1980	9.893832599118943
1981	10.412587412587413
1982	13.64941525571653
1983	16.25130707563611
1984	18.91378110318427
1985	18.85380472550382
1986	19.53642671292281
1987	23.459040526498097
1988	24.33468787826388
1989	29.084081491712706
1990	31.24978451991036
1991	34.896729776247845
1992	35.23525114940059
1993	31.552389942504075
1994	39.84746561549338
1995	40.090278966284444
1996	44.00769066438795
1997	45.86568819865176
1998	51.766009117634525
1999	40.16337644656229
2000	31.01699235344095
2001	30.79660297239915
2002	16.680942184154176
2003	5.058747300215983
2004	8.025217391304349
2005	3.568859649122807
2006	5.642035398230089
2007	1.6089285714285715
2008	1.364864864864865
2009	18.202727272727273
2010	25.08669724770642
2011	35.809867295510244
2012	26.694995278564683
2013	54.44512771996216
2014	67.37034583905
2015	74.11414107962341
2016	74.68116572834367
2017	65.51327056819795
2018	86.8841368216871
2019	87.27528031414109
2020	101.97744239958368
2021	97.83852013057671