Year	kilograms per hectare of arable land
1961	9.854281329687193
1962	10.751450291197958
1963	13.107420820586647
1964	12.92541043698487
1965	13.391317717084528
1966	14.540437246963563
1967	17.294464991846176
1968	20.33953536935526
1969	21.240720948813465
1970	25.893026652062797
1971	28.179565512559403
1972	35.01834741954702
1973	37.359899766823
1974	39.65933737524476
1975	40.11692824604207
1976	46.96773345736885
1977	51.746452162675325
1978	51.18891958608454
1979	54.032472843212126
1980	58.516020100219365
1981	47.72994320517471
1982	47.375703330580606
1983	42.1017197820402
1984	54.76502928881725
1985	54.27171220797897
1986	63.53405839591445
1987	66.40056087324969
1988	65.16332479097738
1989	60.62560056035233
1990	59.353433893251484
1991	59.70738864424485
1992	61.439585765102706
1993	70.14293314024114
1994	76.63480637555698
1995	68.65717630451033
1996	82.45346302766367
1997	90.43826993147219
1998	90.4395690921203
1999	89.86838974116455
2000	96.88883912022665
2001	99.80798362420632
2002	102.44113139260648
2003	114.26022282961605
2004	132.47221194390693
2005	109.2793670448049
2006	113.43899214127785
2007	135.53635531266625
2008	121.84862976906186
2009	95.60507214910697
2010	123.35212375319901
2011	146.67637853051974
2012	136.63912104202666
2013	152.64897575258297
2014	161.21705119059783
2015	137.6125078535519
2016	147.91569141020912
2017	165.14859640456464
2018	172.71368326882927
2019	170.76412640021405
2020	198.1756562617041
2021	206.62799168931005