Year	kilograms per hectare of arable land
1961	17.910083333333333
1962	21.580995850622408
1963	24.380165289256198
1964	28.304526748971192
1965	29.84426229508197
1966	35.04791547219264
1967	38.6560811916844
1968	41.44925165617077
1969	41.5822164105917
1970	45.545120457329524
1971	50.36722702790925
1972	56.78055940634429
1973	56.73076923076923
1974	58.3187036886247
1975	62.87323026851099
1976	66.10293519798357
1977	70.54306142346441
1978	74.35869123974994
1979	78.29271458705176
1980	86.28601540332387
1981	99.87734931950746
1982	91.7118575475516
1983	71.07454471873736
1984	77.96462970457304
1985	70.96875758802105
1986	66.1034126984127
1987	56.74589641434263
1988	65.62063492063493
1989	61.7207874015748
1990	61.334921875
1991	57.372093023255815
1992	55.671199574565065
1993	62.817145836436765
1994	55.9182156133829
1995	56.81481481481482
1996	58.89377289377289
1997	55.54744525547445
1998	57.13868613138686
1999	56.446220930232556
2000	53.59832030118737
2001	55.7179393496529
2002	61.20489051094891
2003	55.15007352941176
2004	60.287593984962406
2005	47.33100569259962
2006	62.33642857142857
2007	61.021746031746034
2008	56.293203125
2009	55.75039494470774
2010	53.77802601133009
2011	60.334081276489655
2012	61.583333333333336
2013	67.5
2014	66.49166666666666
2015	62.675
2016	57.25
2017	72.825
2018	90.0905175
2019	91.7907675
2020	94.2536325
2021	104.63882333333333