Year	kilograms per hectare of arable land
1961	124.59147411235668
1962	134.8580727944168
1963	143.00634551694412
1964	152.7605751957194
1965	160.1621982092896
1966	166.18218309948236
1967	180.05263291646784
1968	188.6672645612237
1969	200.367706518149
1970	215.49770330706482
1971	233.80318511092474
1972	244.25972665863748
1973	256.93308446581614
1974	235.1770028155944
1975	235.26731620689446
1976	251.39940072907254
1977	254.3998133836632
1978	272.54944388362526
1979	283.1460139708081
1980	272.1643016860422
1981	261.1914816328384
1982	260.9563991395403
1983	267.30191306785633
1984	270.92652160105996
1985	273.98643335690764
1986	278.6363228815401
1987	278.47452846925177
1988	283.7142896429079
1989	275.35777070911536
1990	250.3599164971729
1991	240.47687711198307
1992	205.32020638512887
1993	200.21209723244115
1994	208.69740583704234
1995	211.31270906514808
1996	217.15760441123547
1997	213.60826180288262
1998	218.20034759713377
1999	217.17700231329297
2000	197.18585872404788
2001	197.08489447057704
2002	193.33905487175832
2003	200.37584063056798
2004	193.99165342998148
2005	179.2076144944514
2006	176.51321639754465
2007	191.46655192418072
2008	144.06518957785926
2009	133.13390635529672
2010	157.12837743169777
2011	149.21002888319848
2012	157.13221959435973
2013	165.483756139393
2014	171.07195487171262
2015	170.68432839555794
2016	166.4068921805371
2017	170.4720410287799
2018	167.3744527814928
2019	163.8659071954961
2020	168.32334227084567
2021	157.6194075811363