Year	kilograms per hectare of arable land
1961	0.40217391304347827
1962	0.3763440860215054
1963	0.512127659574468
1964	0.6237894736842106
1965	0.7360416666666667
1966	1.52375
1967	1.9228865979381444
1968	2.247835051546392
1969	2.9942268041237114
1970	3.5066006600660065
1971	4.176155115511551
1972	4.534
1973	5.7338
1974	6.753333333333333
1975	6.411764705882353
1976	8.431372549019608
1977	10.627450980392156
1978	11.276153846153846
1979	19.428571428571427
1980	17.580952380952382
1981	14.628571428571428
1982	15.276190476190477
1983	16.742857142857144
1984	29.485714285714284
1985	34.38095238095238
1986	37.36952380952381
1987	41.46666666666667
1988	44.84905660377358
1989	43.0754
1990	41.4
1991	24.944444444444443
1992	39.62264150943396
1993	62.142857142857146
1994	76.03960396039604
1995	69.5625
1996	73.83333333333333
1997	81.0909090909091
1998	87.11363636363636
1999	90.25581395348837
2000	86.32558139534883
2001	148.65116279069767
2002	141.0222222222222
2003	25.488888888888887
2004	24.696
2005	47.05096774193549
2006	46.545833333333334
2007	37.85050505050505
2008	57.19
2009	60.196438356164386
2010	34.29
2011	39.097674418604655
2012	49.41604260738682
2013	50.62475814845248
2014	19.704234252364664
2015	15.565717448178708
2016	28.960730529281545
2017	50.636669349969814
2018	55.176784061179326
2019	55.176784061179326
2020	55.176784061179326
2021	55.176784061179326