Year	kilograms per hectare of arable land
1966	0.011450381679389313
1967	0.015186028853454821
1968	0.0264750378214826
1969	0.40617935192162774
1970	0.07507507507507508
1971	0.29850746268656714
1972	0.5278810408921933
1973	0.9
1974	1.062730627306273
1975	4.4475421863536315
1976	2.239178283198826
1977	2.1562729273661043
1978	8.131868131868131
1979	10.717423133235725
1980	8.28623718887262
1981	8.760233918128655
1982	9.046783625730994
1983	11.407894736842104
1984	14.239766081871345
1985	13.629737609329446
1986	11.793002915451895
1987	6.773255813953488
1988	12.936046511627907
1989	12.617561683599419
1990	14.74655285620486
1991	12.827225130890053
1992	10.595065312046444
1993	6.781750924784217
1994	7.191149354640443
1995	8.022045315370484
1996	4.918032786885246
1997	12.009956440572495
1998	11.255115089514067
1999	9.75048480930834
2000	9.836893203883495
2001	11.118690313778991
2002	8.197879858657243
2003	4.496805111821086
2004	13.664150943396226
2005	3.808080808080808
2006	8.423580786026202
2007	21.406593406593405
2008	14.634538152610443
2009	12.040990606319385
2010	19.457784663051896
2011	12.4031007751938
2012	16.022574750830564
2013	30.376353039134056
2014	22.431848127600556
2015	1.7949630801687764
2016	18.9824237999635
2017	12.732158211521925
2018	1.6485946872322192
2019	10.572918825561311
2020	10.628963730569948
2021	10.628963730569948