Year	kilograms per hectare of arable land
1961	10.969762360010925
1962	12.39003655069717
1963	13.403918411164788
1964	14.900572036716776
1965	18.293537325244
1966	21.246612607899554
1967	23.139328424460807
1968	18.809101808893292
1969	18.953582765259927
1970	20.833203469949613
1971	22.80387886330637
1972	26.25324373223055
1973	31.14704215191178
1974	31.843632814506602
1975	33.48269151986891
1976	34.089748825811725
1977	41.180048661800484
1978	45.16810952285081
1979	45.174430227908836
1980	48.10651181258686
1981	47.952092266745524
1982	50.60571876992496
1983	57.084289130753085
1984	59.95434455291661
1985	56.18202909758809
1986	51.96613675172563
1987	53.48456388768482
1988	51.375039182118485
1989	52.29799613713182
1990	50.133004568859235
1991	52.594874781828956
1992	54.79428585276014
1993	57.243024215072545
1994	58.177080802682084
1995	62.46180977864267
1996	65.6696461189995
1997	66.42785778687526
1998	64.58612702669755
1999	65.6024199253531
2000	59.68585096775768
2001	60.42089967763993
2002	64.88235873445771
2003	66.6676927659997
2004	62.11334451425568
2005	70.63817649434571
2006	53.96828144489983
2007	78.83548503240408
2008	73.55244900610627
2009	71.58433545134694
2010	79.65645978719452
2011	96.89352286442269
2012	104.22452363190708
2013	96.4984252176905
2014	102.15082036180058
2015	104.35713912543754
2016	99.27329353750325
2017	101.82035368355449
2018	111.81183768415612
2019	106.73256054647071
2020	131.39793383026023
2021	126.06184165817193