Year	kilograms per hectare of arable land
1961	2.781954887218045
1962	2.756892230576441
1963	2.756892230576441
1964	4.010025062656641
1965	5.25
1966	5.3
1967	6.75
1968	3.75
1969	3.75
1970	4.25
1971	4.125
1972	4.364089775561097
1973	4.738154613466334
1974	4.890274314214464
1975	5.985037406483791
1976	4.987531172069826
1977	5.236907730673317
1978	5.236907730673317
1979	2.729528535980149
1980	3.4739454094292803
1981	3.4739454094292803
1982	4.444444444444445
1983	3.2098765432098766
1984	2.962962962962963
1985	1.1081081081081081
1986	1.6658476658476657
1987	2.2004889975550124
1988	2.2004889975550124
1989	2.1739130434782608
1990	2.142857142857143
1991	3
1992	3.6
1993	2.857142857142857
1994	2.5316455696202533
1995	6.620289855072464
1996	9.684057971014493
1997	12.666666666666666
1998	18.469565217391306
1999	19.166666666666668
2000	13.142857142857142
2001	23
2009	48.60443037974684
2010	83.12741312741312
2011	29.679012345679013
2012	54.835087719298244
2013	80.51785714285714
2014	57.843283582089555
2015	66.03293528505391
2016	46.92161016949152
2017	33.18370570107858
2018	58.230585516178735
2019	51.29111538461539
2020	66.19461538461539
2021	59.266615384615385