Year	kilograms per hectare of arable land
1961	41.43608009241432
1962	52.8555469953775
1963	57.67372473532242
1964	65.63917130251295
1965	68.35704723656531
1966	74.10717703349282
1967	98.48609779482263
1968	120.79661993470329
1969	134.34230769230768
1970	161.209897939534
1971	183.95428240740742
1972	196.3762796986672
1973	232.26294435857804
1974	260.52602846558784
1975	296.0748829953198
1976	271.72043852779956
1977	297.94616446460265
1978	305.0697582243361
1979	298.16597180861623
1980	278.322060871295
1981	295.25144106539454
1982	304.4961147638972
1983	316.0101593625498
1984	303.1352695444599
1985	265.68149324861
1986	274.31052944675787
1987	271.90015847860536
1988	280.70039603960396
1989	238.67775138558986
1990	134.53581321725366
1991	64.50336234177215
1992	39.856600590468155
1993	61.625947767481044
1994	66.0608549168246
1995	76.60112359550561
1996	94.55975888588651
1997	88.60746887966805
1998	76.9039219755136
1999	89.84423676012462
2000	90.6179921773142
2001	98.51302648719061
2002	94.8762483716891
2003	95.49706330215358
2004	98.52109612875164
2005	85.19886981091067
2006	99.19512725690667
2007	110.40940766550523
2008	96.70076335877863
2009	77.48222464558343
2010	84.33424408014572
2011	93.28828213879409
2012	99.61541960427564
2013	113.55861909175162
2014	112.70823692734845
2015	114.14754856614246
2016	138.1730279898219
2017	152.3786722183669
2018	150.85892691951895
2019	145.98563817465833
2020	162.61673119977684
2021	161.81058724869342