Year	kilograms per hectare of arable land
1961	0.48011363636363635
1962	0.4830917874396135
1963	0.5436337625178826
1964	0.8931143762604437
1965	0.8700696055684455
1966	1.022196261682243
1967	1.0294117647058822
1968	0.740521327014218
1969	0.7458233890214797
1970	0.9011715229798738
1971	0.8774583963691377
1972	0.853398354160317
1973	0.30703101013202333
1974	0.5652442795299938
1975	0.4672897196261682
1976	0.40803515379786565
1977	0.2530044275774826
1978	0.3186743148502231
1979	0.7062600321027287
1980	0.09058557101261727
1981	0.2663840886860124
1982	0.2780151166611896
1984	0.0657543391188251
1985	0.12113055181695828
1986	0.22116689280868385
1987	0.307797537619699
1988	0.21751120303343674
1989	0.28362877997914493
1990	0.4069400630914827
1991	0.6850477200424178
1992	0.1803921568627451
1993	0.5661394680086269
1994	1.4503263234227701
1995	1.8675932699341624
1996	1.5535648994515538
1997	0.6564327485380117
1998	1.1998538545853124
1999	1.168736303871439
2000	1.1683096020445418
2001	1.167883211678832
2002	0.8755928493250639
2003	0.7166301969365426
2004	0.957710535909588
2005	0.9197373221452024
2006	0.8836363636363637
2007	1.2135714285714285
2008	1.2975438596491229
2009	0.6340350877192983
2010	0.9327586206896552
2011	3.583103448275862
2012	2.9318333333333335
2013	2.868067741935484
2014	1.0230870967741936
2015	0.9128258064516129
2016	0.7577419354838709
2017	8.512222580645162
2018	6.857345161290323
2019	6.857345161290323
2020	6.857345161290323
2021	6.857345161290323