Year	kilograms per hectare of arable land
1961	0.058878188883257306
1962	0.07072996683876925
1963	0.08731383755371074
1964	0.11613732481963679
1965	0.15038120750051515
1966	0.30024986687420635
1967	0.29564332247557
1968	0.4087744859964384
1969	0.41862804264735465
1970	0.2757379409647228
1971	0.3675944333996024
1972	0.7731351543661303
1973	0.5973903474296495
1974	1.1292591434823382
1975	2.1096390691169042
1976	3.051842694892992
1977	2.8424368133978644
1978	2.7271685573507507
1979	4.113491340018231
1980	6.568212720954827
1981	8.008113285505015
1982	7.9563706996376675
1983	9.640389330559477
1984	9.835581008682801
1985	8.179914011685591
1986	9.382309941520468
1987	8.554690342769813
1988	11.73498845265589
1989	13.048623063683305
1990	14.261594357768754
1991	14.8
1992	14.617940199335548
1993	15.315614617940199
1994	9.548387096774194
1995	5.562310030395137
1996	5.241691842900302
1997	4.147590361445783
1998	4.8
1999	4.791428571428572
2000	5.357142857142857
2001	6.198984600712462
2002	4.314671598296346
2003	6.017385705086928
2004	4.449637772370004
2005	7.241182717567492
2006	10.315267772379517
2007	4.340549588506068
2008	5.896981352955933
2009	4.565876545888479
2010	11.21455203116305
2011	6.201773650996636
2012	8.427197733522206
2013	8.509126935671866
2014	8.957569178727885
2015	7.965850901736986
2016	10.73497467408453
2017	20.295907079646017
2018	18.84129599121362
2019	18.61032761987416
2020	18.61032761987416
2021	18.61032761987416