Year	kilograms per hectare of arable land
1967	0.0970873786407767
1968	0.1765834932821497
1969	0.4034090909090909
1970	0.3831417624521073
1971	0.39285714285714285
1972	0.533011272141707
1973	0.5459016393442623
1974	0.6931137724550899
1975	0.40816326530612246
1976	0.44571428571428573
1977	0.4195804195804196
1978	0.410958904109589
1979	0.40268456375838924
1980	0.13157894736842105
1981	0.3870967741935484
1982	1.2658227848101267
1983	0.8695652173913043
1984	1.951219512195122
1985	1.6928657799274487
1986	1.2386091127098322
1987	2.3681710213776723
1988	0.6607773851590106
1989	0.691764705882353
1990	3.396590909090909
1991	1.7988636363636363
1992	0.7840909090909091
1993	1.6470588235294117
1996	0.4
1997	0.5
1998	0.36585365853658536
1999	0.3464203233256351
2000	0.3
2001	0.2727272727272727
2002	2.1944444444444446
2003	2.188561215370867
2004	1.815343443354148
2005	3.0249110320284696
2006	3.448092280390417
2007	7.808849557522124
2008	9.499116607773852
2009	1.2469775474956821
2010	0.07939189189189189
2011	0.09421487603305785
2012	4.724113360323886
2013	10.476835844567802
2014	11.266550116550118
2015	17.60881211180124
2016	8.772072981366458
2017	17.394965089216445
2018	14.925303643724696
2019	25.03890939597315
2020	29.098048740326032
2021	23.901182592242193