Year	kilograms per hectare of arable land
1961	59.67555242983426
1962	64.6749752626582
1963	69.80792112759917
1964	74.71315288014814
1965	80.25345885371154
1966	86.73220378707116
1967	94.69254618251618
1968	96.91879799564833
1969	99.27906769874518
1970	105.53427261203224
1971	111.80931971827142
1972	116.78032399082353
1973	126.81029256489303
1974	119.02728335880343
1975	124.90405729124981
1976	133.39614688592258
1977	134.62160500000127
1978	140.21868439164643
1979	144.53794329022617
1980	141.65770465189485
1981	137.64462643327275
1982	132.3604790278269
1983	138.5497671135311
1984	141.22099533475205
1985	137.43310783307837
1986	136.7669805679891
1987	138.46334915903213
1988	139.1695249672789
1989	139.5567151256857
1990	129.60018372527654
1991	124.63042335581785
1992	122.4669631954182
1993	126.50458842658
1994	127.14016854956286
1995	128.5254088872722
1996	133.35055860359657
1997	133.34603232372697
1998	133.0766930564515
1999	132.36809253454294
2000	126.53741330292138
2001	126.15007449482982
2002	125.59093826376746
2003	134.07379586634647
2004	130.8196973175476
2005	128.14208125306303
2006	130.06539360274468
2007	134.82117824855678
2008	112.09519970149273
2009	115.895238675638
2010	127.75291412968473
2011	129.63332611365547
2012	134.71198722443927
2013	137.29200929159788
2014	136.32789812818237
2015	136.98847169151134
2016	139.58484840302594
2017	141.29608822140256
2018	139.7736577014721
2019	139.05360972011917
2020	143.8166505589685
2021	139.39959885945157