Year	kilograms per hectare of arable land
1961	3.1714285714285713
1962	3.4571428571428573
1963	4.577714285714285
1964	5.5042857142857144
1965	6.864
1966	8.763428571428571
1967	9.514285714285714
1968	9.371428571428572
1969	12.085714285714285
1970	14.142857142857142
1971	13.485714285714286
1972	15.196857142857143
1973	14.560571428571428
1974	15.085714285714285
1975	11.708947368421052
1976	14.183157894736842
1977	13.558421052631578
1978	13.42157894736842
1979	10.078947368421053
1980	16.210526315789473
1981	21.789473684210527
1982	16.5
1983	19.763157894736842
1984	21.948187919463088
1985	22.431132487975514
1986	21.423905943827563
1987	23.70848549946294
1988	24.80540761982794
1989	20.121373032429357
1990	21.382765531062123
1991	22.111045713164607
1992	19.255479969765684
1993	19.76284584980237
1994	23.807776962582537
1995	14.417065097462302
1996	34.42517662170842
1997	27.918570835064397
1998	27.169730654125694
1999	29.062009419152275
2000	29.790431404620733
2001	29.24921996879875
2002	27.313101551758006
2003	33.096774193548384
2004	27.680867249904907
2005	34.326557750759875
2006	33.154802259887006
2007	36.39528301886792
2008	33.28754716981132
2009	34.04305272727273
2010	32.79252181818182
2011	39.58978965517241
2012	48.0832224137931
2013	56.576655172413794
2014	47.73076034482759
2015	38.88486551724138
2016	48.38220172413793
2017	63.084543103448276
2018	48.12313103448276
2019	57.28757068965518
2020	65.815
2021	60.66206896551724