Year	kilograms per hectare of arable land
1974	0.7217391304347827
1975	0.8695652173913043
1976	0.8333333333333334
1977	0.8333333333333334
1978	0.8333333333333334
1979	0.8
1980	0.7692307692307693
1981	0.7692307692307693
1982	0.7407407407407407
1983	1.717241379310345
1984	1.3103448275862069
1985	0.6896551724137931
1986	0.6896551724137931
1987	0.684931506849315
1988	0.7092198581560284
1989	0.7518796992481203
1990	0.7407407407407407
1991	0.7407407407407407
1992	0.7407407407407407
1993	0.7352941176470589
1994	0.7142857142857143
1995	0.684931506849315
1996	0.6622516556291391
1997	0.6535947712418301
2002	6.9423076923076925
2003	6.993630573248407
2004	7.39873417721519
2005	7.5568862275449105
2006	7.620621282220753
2007	9.00953778429934
2008	11.66
2009	23.96
2010	10.03976143141153
2011	13.053892215568862
2012	10.688023952095808
2013	12.155089820359281
2014	14.20069860279441
2015	14.760578842315367
2016	14.069099999999997
2017	13.272804232804233
2018	21.283936170212765
2019	14.312127659574468
2020	14.312127659574468
2021	14.312127659574468