Year	kilograms per hectare of arable land
1961	66.68321392409491
1962	72.3525878765055
1963	77.93070390079777
1964	83.67185072228565
1965	89.7393130743809
1966	96.59637956344832
1967	105.09625881135915
1968	106.91694831195754
1969	108.14020791304877
1970	114.13650730488828
1971	119.8841882637558
1972	124.22600203771643
1973	134.48532328657606
1974	125.58287629397158
1975	130.5621754536167
1976	139.4582308229258
1977	140.7360561875582
1978	146.27586272064104
1979	152.25678877769508
1980	148.60829651244995
1981	144.81543507460194
1982	137.4061404175113
1983	143.42015915961633
1984	146.74572523733963
1985	141.95263969804495
1986	139.8601312555192
1987	141.692325527699
1988	142.98430138275745
1989	143.30477689777464
1990	135.68789216830916
1991	131.20194138201532
1992	124.37886859277369
1993	122.45030080769861
1994	123.2995605100963
1995	123.76303351457764
1996	127.32899860357851
1997	127.17626864668458
1998	125.47106256286672
1999	124.29335911845268
2000	118.19886771105053
2001	119.12778247698363
2002	119.28093035070349
2003	126.66762027395737
2004	122.77464514257282
2005	119.02412583787994
2006	122.36330347265054
2007	126.94213259054185
2008	107.20492737498459
2009	108.47406735237199
2010	120.25037365591128
2011	123.3826471002344
2012	126.72697656792921
2013	128.29834816446396
2014	127.13478878243532
2015	127.42323032371046
2016	126.75898310663524
2017	129.0089458878758
2018	129.62058794633143
2019	127.96522483127669
2020	133.37423073853302
2021	129.40785562180147