Year	kilograms per hectare of arable land
1961	14.53193225872271
1962	18.09610655737705
1963	19.135802469135804
1964	18.223140495867767
1965	23.485477178423235
1966	22.1875
1967	24.811764705882354
1968	31.408879492600423
1969	43.22595744680851
1970	43.07323340471092
1971	44.98277347114556
1972	41.1063829787234
1973	54.42968421052632
1974	59.41854166666667
1975	46.78350515463917
1976	53.74
1977	51.09823529411765
1978	60.53436893203884
1979	65.82692307692308
1980	63.886763580719204
1981	61.227777777777774
1982	65.95419847328245
1983	69.10209125475285
1984	50.0907196969697
1985	53.02373831775701
1986	72.18518518518519
1987	89.61715867158672
1988	92.73566176470588
1989	97.76135531135532
1990	107.13357664233577
1991	81.614361217423
1992	92.9898804047838
1993	105.01207056638812
1994	112.50196813495782
1995	113.22743614001892
1996	140.74498567335243
1997	156.0646094503375
1998	122.38247322297956
1999	146.266273352999
2000	145.91775923718714
2001	156.7847110754414
2002	139.3404255319149
2003	166.9963782696177
2004	171.7595703125
2005	156.53246753246754
2006	143.57924345295828
2007	159.30812854442345
2008	104.97302752293578
2009	121.44527272727272
2010	151.43547169811322
2011	144.8612844036697
2012	118.35125448028674
2013	155.87503935599284
2014	157.34359033989267
2015	139.42342576028622
2016	169.62518604651163
2017	212.59871377459748
2018	169.00107334525939
2019	195.4843810375671
2020	209.16787835420394
2021	232.02526475849731