Year	kilograms per hectare of arable land
1961	4.935483870967742
1962	6.857096774193549
1963	6.558387096774194
1964	6.321383647798742
1965	6.8757861635220126
1966	7.648427672955975
1967	7.227987421383648
1968	9.049056603773584
1969	12.101381042059009
1970	10.679611650485437
1971	11.71875
1972	11.145510835913313
1973	11.999696048632218
1974	15.04880239520958
1975	15.35982404692082
1976	15.60344827586207
1977	12.418485965409698
1978	16.17345443891005
1979	17.615971814445096
1980	19.49232215606393
1981	26.463722397476342
1982	25.683860759493673
1983	25.063694267515924
1984	28.237179487179485
1985	31.400651465798045
1986	34.75247524752475
1987	35.100671140939596
1988	34.502724795640326
1989	35.63573883161512
1990	28.841526297696802
1991	34.009628610729024
1992	36.12207702888583
1993	31.938399732172748
1994	31.448763250883392
1995	27.0935960591133
1996	34.09490333919157
1997	33.926186291739896
1998	39.546022924626605
1999	38.56995531110347
2000	38.86173184357542
2001	36.04902667627974
2002	36.809815950920246
2003	39.60573476702509
2004	42.672877104980294
2005	45.45787545787546
2006	44.91494752081071
2007	46.13977314306623
2008	40.84656084656085
2009	48.39305504248245
2010	47.43181013106624
2011	48.39732300105671
2012	49.508426966292134
2013	40.413599719593414
2014	45.749613601236476
2015	53.11284046692607
2016	61.98314869714464
2017	48.755226514250644
2018	57.24626400996264
2019	55.66652786425904
2020	31.55652173913044
2021	48.04885035142867