Year	kilograms per hectare of arable land
1961	21.957559681697614
1962	20.211886304909562
1963	24.231738035264485
1964	33.90663390663391
1965	36.31961259079903
1966	35.222482435597186
1967	38.535469107551485
1968	37.13646532438479
1969	41.225382932166305
1970	45.524625267665954
1971	55.932914046121596
1972	52.96066252587992
1973	63.47826086956522
1974	62.67748478701826
1975	59.71926977687627
1976	49.46653144016227
1977	39.02434077079108
1978	45.801217038539555
1979	45.60040567951319
1980	69.24630738522954
1981	68.15009823182712
1982	59.60077369439072
1983	58.857142857142854
1984	49.906191369606006
1985	62.896487985212566
1986	56.451730418943534
1987	50.15125448028674
1988	56.32402826855124
1989	54.2198606271777
1990	57.623711340206185
1991	55.702372881355934
1992	37.9933110367893
1993	52.61254125412541
1994	55.064516129032256
1995	46.62379421221865
1996	49.411764705882355
1997	50
1998	51.470588235294116
1999	52.11267605633803
2000	45.916666666666664
2001	42.27777777777778
2002	35.701369863013696
2003	40.00876712328767
2004	22.72421052631579
2005	21.79948717948718
2006	32.35634146341464
2007	27.03525
2008	21.99411764705882
2009	28.778048780487804
2010	34.083
2011	26.548333333333332
2012	18.25
2013	25.625
2014	25.775
2015	19.65
2016	32.575
2017	36.6
2018	33.2
2019	33.2
2020	25.975
2021	25.975