Year	kilograms per hectare of arable land
1964	0.008696408383337682
1965	0.008697164724299879
1966	0.008697164724299879
1967	0.02565663593668464
1968	0.020944558521560575
1969	0.028423560338453956
1970	0.015629186389211396
1971	0.02244788882950294
1972	0.03606909514006981
1973	0.036077705827937095
1974	0.01605973813420622
1975	0.06454582651391162
1976	0.11786372007366483
1977	0.21301411909146717
1978	0.17198690403110292
1979	0.1812700964630225
1980	0.2637093615354485
1981	0.5694842406876791
1982	0.2855257815671945
1983	0.1799640071985603
1984	0.23925501432664756
1985	0.3655066530194473
1986	0.2031729785056295
1987	0.30035781940644074
1988	0.18231636631889556
1989	0.2868459453825308
1990	0.20831823124320406
1991	0.04383063182269269
1992	0.1078001078001078
1993	0.11550900970275682
1994	0.47092799383904504
1995	0.7135502323918484
1996	0.6435466571326421
1997	0.050053628888094386
1998	0.03575514874141877
1999	0.2994851258581236
2000	0.32372093023255816
2001	0.35662133142448105
2002	0.6118194842406877
2003	0.29366548042704627
2004	0.23998582063098192
2005	0.3876655101607307
2006	0.5276225507533423
2007	0.3549078726968174
2008	0.1534182305630027
2009	0.353489932885906
2010	0.4960264900662252
2011	0.4856410256410256
2012	0.9232949685534592
2013	0.6371505952380954
2014	0.9992434523809521
2015	0.4061910714285714
2016	0.38600685714285715
2017	0.381645197740113
2018	0.6947694915254237
2019	0.9494615819209039
2020	0.586468361581921
2021	0.586468361581921