Year	kilograms per hectare of arable land
1961	0.013653483992467044
1962	0.05154639175257732
1963	0.03591417910447761
1964	0.045137273150302464
1965	0.04631773969430292
1966	0.04608294930875576
1967	0.045871559633027525
1968	0.091324200913242
1969	0.20708446866485014
1970	0.2581227436823105
1971	0.4018181818181818
1972	0.4829097283085013
1973	0.2562685932851679
1974	0.4932182490752158
1975	0.4788507581803671
1976	1.8823529411764706
1977	2.6403846153846153
1978	3.7260377358490566
1979	2.6703703703703705
1980	1.5693989071038252
1981	3.531182795698925
1982	3.672183098591549
1983	4.60207972270364
1984	3.909897610921502
1985	4.07248322147651
1986	5.401652892561984
1987	5.805528455284553
1988	4.325414997137951
1989	5.835127478753541
1990	6.038801711840228
1991	5.944252873563219
1992	6.175397973950796
1993	6.122448979591836
1994	6.739363284736686
1995	7.191715976331361
1996	6.9238505747126435
1997	11.263756613756614
1998	12.88
1999	10.86086086086086
2000	8.292104619897335
2001	0.3990924289467399
2002	0.4692972215736633
2003	12.105070808588396
2004	12.893831023692446
2005	16.344420131291027
2006	13.504823151125402
2007	10.395925225792901
2008	11.778258184064237
2009	10.879644588045235
2010	11.20661648177496
2011	11.861559401127746
2012	15.537665585035311
2013	17.96756138706654
2014	17.547797421731122
2015	17.684466159971045
2016	23.2374777659196
2017	19.073765961168444
2018	18.13724582831584
2019	9.6884582839736
2020	17.169696868754166
2021	11.911055737704919