Year	kilograms per hectare of arable land
1961	5.648899507729144
1962	6.601319492341213
1963	7.837409174232832
1964	8.981213437080347
1965	10.861169997389664
1966	13.76912391695324
1967	14.189597265828446
1968	16.219677701920627
1969	18.190484595322488
1970	20.87957275500022
1971	22.66818374450035
1972	25.742557879158284
1973	28.348435544612787
1974	26.99516573814739
1975	31.64426253593753
1976	33.07198177610112
1977	40.509731170967
1978	45.204110637002344
1979	49.841978268413506
1980	55.35478753935826
1981	55.3657632140106
1982	57.43283069357903
1983	61.40604132941768
1984	66.35681587763365
1985	63.00054722955776
1986	66.90648843995163
1987	72.66694904987725
1988	80.3067090389216
1989	80.82968822922663
1990	84.35555872234087
1991	87.28186637122938
1992	79.22746081016558
1993	72.55589808066536
1994	75.35778884777382
1995	81.98558536662733
1996	84.59021938389172
1997	87.89734387095183
1998	89.17121518783418
1999	91.9343009502574
2000	89.35774634150972
2001	91.63725196398548
2002	95.86458088282494
2003	97.18368996210955
2004	105.79953912469617
2005	107.43078998246345
2006	111.22173597938848
2007	116.99137340416716
2008	114.37115485090258
2009	115.3026424223026
2010	126.34422981772964
2011	132.06247685582665
2012	128.69646342612467
2013	131.16781122777385
2014	135.99753224359134
2015	133.1196515816957
2016	133.8609510400118
2017	138.8635936311046
2018	137.41667481572614
2019	132.7044527677929
2020	142.15481865156406
2021	140.36648283537846