Year	kilograms per hectare of arable land
1961	0.1437908496732026
1962	0.14285714285714285
1963	0.14193548387096774
1964	0.14102564102564102
1965	0.14102564102564102
1966	0.1914486279514997
1967	1.2748597654258031
1968	1.9122896481387048
1969	2.162849872773537
1970	2.4650571791613722
1971	2.5949367088607596
1972	3.680151706700379
1973	3.1099873577749686
1974	4.285714285714286
1975	4.599747155499368
1976	5.592414664981036
1977	6.8553729456384325
1978	6.784955752212389
1979	6.288116308470291
1980	6.46346396965866
1981	5.778887484197218
1982	6.672945638432364
1983	7.152970922882427
1984	9.178255372945639
1985	9.22402022756005
1986	8.505689001264223
1987	9.989886219974716
1988	7.04551201011378
1989	7.029077117572693
1990	5.625790139064476
1991	6.144121365360303
1992	5.790139064475348
1993	5.112474437627812
1996	0.6538511834706421
1997	0.6506180871828237
1998	0.9024107257960552
1999	0.6533385600418137
2000	0.6507874528179096
2001	2.3948978263699074
2002	3.194390466267257
2003	3.4785460627895013
2004	4.2437781473899685
2005	3.8147841127482383
2006	3.190854503464203
2007	2.1012689248139593
2008	1.8516846292019502
2009	1.887862184011292
2010	1.7778596176055435
2011	3.8270055191888077
2012	2.3778523748395375
2013	4.882714193962749
2014	10.166112469437653
2015	13.324491951062459
2016	13.680146202613534
2017	20.45252889985713
2018	17.352228637413393
2019	10.9725
2020	8.714494826925533
2021	5.202572486907651