Year	kilograms per hectare of arable land
1961	24.728571428571428
1962	25.214285714285715
1963	27.514285714285716
1964	21.63142857142857
1965	26.722857142857144
1966	23.498591549295774
1967	26.892957746478874
1968	24.50985915492958
1969	30.44788732394366
1970	27.919444444444444
1971	33.68888888888889
1972	41.43611111111111
1973	44.3646408839779
1974	45.027624309392266
1975	35.01923076923077
1976	28.644312259082337
1977	21.284447179518416
1978	34.30465367965368
1979	29.211232123902356
1980	15.849108557956122
1981	37.81183368869936
1982	27.390379473976353
1983	27.47449221274562
1984	39.01523109243698
1985	32.22909126924292
1986	55.8807260645567
1987	34.42028985507246
1988	36.830353980910544
1989	41.7805914029897
1990	30.612244897959183
1991	39.60730876715396
1992	30.828843567119574
1993	30.18108651911469
1994	27.787047080520104
1995	37.37541838666266
1996	32.986111111111114
1997	38.69486185855317
1998	36.61533720636773
1999	46.316046966731896
2000	30.642854655612446
2001	31.51260758828439
2002	35.955598455598455
2003	24.9239249740611
2004	48.25016328524899
2005	22.097619047619048
2006	32.58095238095238
2007	32.654761904761905
2008	56.79761904761905
2009	20.254761904761907
2010	39.319047619047616
2011	27.84285714285714
2012	43.54333333333334
2013	61.56542857142857
2014	53.149309523809535
2015	60.99395238095238
2016	44.60404761904762
2017	27.954214285714286
2018	61.86059523809523
2019	62.166142857142866
2020	52.73692857142858
2021	60.88845238095238