Year	kilograms per hectare of arable land
1961	14.587962962962964
1962	11.926605504587156
1963	12.045454545454545
1964	14.446952595936795
1965	17.391304347826086
1966	20
1967	31.762295081967213
1968	74
1969	70.58823529411765
1970	84.64491362763916
1971	101.50943396226415
1972	102.96296296296296
1973	106.02189781021897
1974	114.721723518851
1975	111.01243339253996
1976	125.21739130434783
1977	135.68965517241378
1978	171.35506003430532
1979	168.26758147512865
1980	160.17094017094018
1981	138.43537414965985
1982	179.9660441426146
1983	174.36332767402376
1984	159.59252971137522
1985	159.76230899830222
1986	163.4974533106961
1987	161.01694915254237
1988	163.5593220338983
1989	182.98969072164948
1990	176.1658031088083
1991	54.1522491349481
1992	40.65743944636678
1993	31.0051993067591
1994	25.59792027729636
1995	19.064124783362217
1996	11.265164644714039
1997	8.996539792387543
1998	43.327556325823224
1999	18.370883882149048
2000	32.35294117647059
2001	32.35294117647059
2002	97.58477508650519
2003	99.31956747404844
2004	101.3073356401384
2005	112.37531598513011
2006	85.80246575342466
2007	88.41996539792389
2008	77.30973770491802
2009	90.3783579638752
2010	85.02392971246005
2011	97.43427652733118
2012	93.06155709901469
2013	88.17109058499435
2014	88.3858024691358
2015	107.83124695171517
2016	126.13848137997745
2017	99.80859477124183
2018	66.58507620888989
2019	94.43932786885246
2020	101.42818545697132