Year	kilograms per hectare of arable land
1964	0.3064516129032258
1965	2.912
1966	4.380952380952381
1967	3.5703125
1968	2.375
1969	1.6923076923076923
1970	2.253846153846154
1971	3.007518796992481
1972	6.159420289855072
1973	6.4125874125874125
1974	6.3882352941176475
1975	4.603658536585366
1976	10.122699386503067
1977	9.729411764705882
1978	18.01129943502825
1979	19.451807228915662
1980	12.735849056603774
1981	7.530386740331492
1982	12.326732673267326
1983	13.114754098360656
1984	12.42603550295858
1985	23.076923076923077
1986	21.468926553672315
1987	14.130434782608695
1988	4.673366834170854
1989	10.922651933701658
1990	3.2085561497326203
1991	4.591836734693878
1992	4.938271604938271
1993	4.968944099378882
1994	4.444444444444445
1995	5.102702702702703
1996	4.2368421052631575
1997	5.365853658536586
1998	11.627906976744185
1999	5.333333333333333
2000	3.4188034188034186
2001	3.278688524590164
2003	10.68560606060606
2004	9.186813186813186
2005	11.20494699646643
2006	10.825938566552901
2007	8.976897689768977
2008	4.260752688172043
2009	6.343457943925234
2010	7.3
2011	10.275555555555556
2012	2.5823111111111112
2013	0.40395555555555557
2014	0.45515555555555554
2015	0.5289111111111112
2016	0.6659777777777778
2017	0.39138636363636364
2018	8.05184090909091
2019	4.219613636363636
2020	0.7801363636363636
2021	2.2363863636363637