Year	kilograms per hectare of arable land
1961	0.6423913043478261
1962	0.6351063829787233
1963	0.4427083333333333
1964	0.826530612244898
1965	1.1
1966	0.7281553398058253
1967	2.3317757009345796
1968	2.7145454545454544
1969	3.847457627118644
1970	4.75
1971	4.24
1972	4.6453125
1973	3.3661538461538463
1974	3.444360902255639
1975	1.762043795620438
1976	1.4285714285714286
1977	0.7692307692307693
1978	1.3241379310344827
1979	0.9047619047619048
1980	0.5746666666666667
1981	1.807843137254902
1982	2
1983	3.4615384615384617
1984	4.688535031847134
1985	7.274683544303797
1986	6.804402515723271
1987	5.918125
1988	4.294409937888199
1989	2.037037037037037
1990	6.813003095975232
1991	7.294444444444444
1992	9.401840490797547
1993	10.447272727272727
1994	10.032352941176471
1995	20.11173184357542
1996	15.733846153846153
1997	18.556190476190476
1998	16.758666666666667
1999	24.652173913043477
2000	14.789915966386555
2001	12.693877551020408
2002	16.366666666666667
2003	0.8022641509433962
2004	0.05471698113207547
2005	0.4619442351168048
2006	0.0132
2007	0.2456
2008	0.3204
2009	6.544
2010	9.134
2011	4.44
2012	10.290419230769233
2013	5.0022777777777785
2014	8.086548148148148
2015	0.13323333333333334
2016	9.949325
2017	0.016396428571428572
2018	36.642753571428564
2019	55.46367142857143
2020	40.21205714285715
2021	40.706017857142854