Year	kilograms per hectare of arable land
1961	99.67937470644871
1962	105.28624879077094
1963	112.99384077376264
1964	122.08291364653876
1965	130.6947334962283
1966	139.09352387730206
1967	153.95496397514185
1968	166.31641309714152
1969	176.6925704247079
1970	189.41656153354586
1971	205.56321017210252
1972	214.98418398281623
1973	230.54064348682488
1974	217.1051250209259
1975	225.71986022021196
1976	233.3176323380918
1977	237.72346081876682
1978	252.36445527353737
1979	259.7987264583876
1980	248.05036527013988
1981	246.50368046682811
1982	245.71091968052238
1983	252.7828897950424
1984	252.18678010183558
1985	251.0308621027526
1986	253.48238506985487
1987	249.96385212371158
1988	255.33733552994124
1989	248.27944774638758
1990	207.1169905593496
1991	181.98654650080064
1992	161.0993239730541
1993	158.00700728464423
1994	163.64719652650257
1995	164.53506460664335
1996	171.6256709160252
1997	169.15187061455757
1998	169.71390720806156
1999	167.41618245193115
2000	157.5286041078246
2001	157.88433755110074
2002	157.12775455597708
2003	165.40149556924976
2004	160.47677766051623
2005	154.5040423484212
2006	153.08618760645433
2007	167.63179035602428
2008	135.12349312721952
2009	121.2423088301888
2010	142.42405130674197
2011	138.3468421964413
2012	142.6189940306641
2013	149.8568020016457
2014	151.93891286540168
2015	155.1682388668991
2016	155.4468066772099
2017	160.47772078389784
2018	156.76345246619195
2019	154.36547295898737
2020	156.3916657286437
2021	150.8972616033935