Year	kilograms per hectare of arable land
1961	8.891654862094825
1962	9.34721352536005
1963	10.314772798234841
1964	11.239300496688742
1965	11.843534899011692
1966	11.557819029251045
1967	12.495007903319394
1968	14.48970210374177
1969	15.68883239586044
1970	17.54516096880295
1971	21.253005174211573
1972	23.079698842739685
1973	25.136241075497495
1974	25.954671847027008
1975	27.507911757911756
1976	29.655474987464807
1977	32.06328126523528
1978	32.86505463295334
1979	38.19195130461753
1980	45.38247060495908
1981	46.89107594254292
1982	53.034577875342585
1983	60.10342803211513
1984	61.286243189284086
1985	65.9725532168831
1986	70.1665052578601
1987	71.38325584897137
1988	72.16941211746406
1989	74.41111661674061
1990	73.73799101043059
1991	68.16030571885925
1992	71.44781673545592
1993	67.54236008537791
1994	65.08602166327009
1995	66.93254823010399
1996	70.22810575714176
1997	74.65253052331498
1998	77.5702028372923
1999	81.33226318447443
2000	86.34845682300733
2001	89.1517248037011
2002	93.5880659078139
2003	85.08706835612479
2004	93.43234347116217
2005	95.75478728341848
2006	103.2665821640815
2007	91.04016398006031
2008	92.93669258662236
2009	84.26674636611888
2010	82.14122973241717
2011	74.31808786295848
2012	73.63441449098389
2013	77.0616847613482
2014	78.20878927010818
2015	73.6665370510637
2016	70.04220104249916
2017	76.95674458558793
2018	78.66443034370286
2019	80.0004324958957
2020	79.93219419958321
2021	80.78926710519282