Year	kilograms per hectare of arable land
1961	16.036036036036037
1962	17.117117117117118
1963	18.91891891891892
1964	16.576576576576578
1965	14.054054054054054
1966	8.288288288288289
1967	20.90592459605027
1968	20.30304114490161
1969	49.206785714285715
1970	55.287566607460036
1971	51.101243339254
1972	45.68920353982301
1973	43.732394366197184
1974	49.78947368421053
1975	57.89473684210526
1976	45.932203389830505
1977	70.16722408026756
1978	56.89281546924487
1979	27.33668341708543
1980	26.123905723905725
1981	37.115397631133675
1982	46.714285714285715
1983	63.94871794871795
1984	64.41580756013745
1985	83.54700854700855
1986	94.08438061041292
1987	76.29817260720101
1988	105.52069597069597
1989	104.25648148148149
1990	104.9408128863083
1991	145.65946348733235
1992	139.19360697420996
1993	136.71138506163888
1994	216.8557833089312
1995	226.48528595224874
1996	267.28483975513143
1997	259.65067043048697
1998	322.2106541731737
1999	342.93333333333334
2000	365.64516129032256
2001	286.7348473454655
2002	295.4877348484849
2003	332.92925087372737
2004	367.81459463637066
2005	339.64871815036173
2006	342.97239603024576
2007	403.517769747686
2008	303.46364027059286
2009	443.7764349206349
2010	365.25342995619343
2011	353.75675872996146
2012	371.13761735897396
2013	483.8578423740425
2014	436.84854044777285
2015	432.2736034157766
2016	424.6974406973422
2017	457.9861840504844
2018	417.4360854993455
2019	427.7796889740566
2020	427.5906011492559
2021	427.5906011492559