Year	kilograms per hectare of arable land
1961	0.4223529411764706
1962	1.1352941176470588
1963	1.2352941176470589
1964	0.8664705882352941
1965	0.6670588235294118
1966	0.7058823529411765
1967	0.7758823529411765
1968	0.7976470588235294
1969	0.6988235294117647
1970	1.9664705882352942
1971	1.6970588235294117
1972	2.6482352941176472
1973	3.907058823529412
1974	5.722941176470588
1975	13.61111111111111
1976	11.38888888888889
1977	17.333333333333332
1978	10
1979	9.736842105263158
1980	6.315789473684211
1981	15.263157894736842
1982	12.904761904761905
1983	10.19047619047619
1984	3.652173913043478
1985	5.208333333333333
1986	3.1666666666666665
1987	4.3544
1988	4.867307692307692
1989	3.2615384615384615
1990	4.814814814814815
1991	2.857142857142857
1992	3.607142857142857
1993	2.702857142857143
1994	2.75
1995	3.2333333333333334
1996	5.4375
1997	5.921111111111111
1998	4.161988061968779
1999	4.167711570336693
2000	3.174027048286228
2001	8.180012259868183
2002	4.076763318585308
2003	7.35845540156673
2004	13.40902474955722
2005	6.019740534255924
2006	20.883627472533274
2007	18.705886191358314
2008	15.849873162039406
2009	20.891209432472227
2010	20.437226784119396
2011	14.60569909944386
2012	37.78139461800668
2013	27.1535150705348
2014	16.69546936767086
2015	24.974167625091376
2016	22.29418005227022
2017	38.24644308079348
2018	27.550257543969323
2019	40.13605931041273
2020	50.11192382003864
2021	37.37177047718151