Year	kilograms per hectare of arable land
1961	3.508771929824561
1962	3.4482758620689653
1963	3.389830508474576
1964	4.083333333333333
1965	4.366393442622951
1966	6.64758064516129
1967	1.5873015873015872
1968	2.4031007751937983
1969	3.0303030303030303
1970	3.4558823529411766
1971	1.7857142857142858
1972	1.7337931034482759
1973	5.628
1974	5.131410256410256
1975	5.7407407407407405
1976	4.232738095238095
1977	4.602298850574712
1978	8.060893854748603
1979	11.907065217391304
1980	21.674074074074074
1981	34.75206185567011
1982	47.3643216080402
1983	97.79681818181818
1984	111.24340425531915
1985	134.69803921568626
1986	152.3962962962963
1987	155.75862068965517
1988	148.52459016393442
1989	152.1875
1990	144.24778761061947
1991	141.93908913104218
1992	147.56164383561645
1993	123.91067538126362
1994	98.1728933733297
1995	77.70177838577291
1996	86.94459681843115
1997	88.21104699093158
1998	90.73412152873247
1999	96.54980523094045
2000	107.51670378619154
2001	106.6
2002	101.52777777777777
2003	106.16666666666667
2004	114
2005	95.91428571428571
2006	106.08695652173913
2007	113.02959953569356
2008	77.56813417190776
2009	71.96495619524406
2010	76.1006289308176
2011	89.74358974358974
2012	99.13378248315688
2013	93.28552803129074
2014	80.11661807580175
2015	91.80515759312321
2016	90.7966637906241
2017	86.99825479930192
2018	87.63848396501457
2019	87.63848396501457
2020	88.65889212827989
2021	88.65889212827989