Year	kilograms per hectare of arable land
1961	0.040293040293040296
1962	0.20085209981740718
1963	0.21237864077669902
1964	0.18148820326678766
1965	0.35042219541616404
1966	1.023465703971119
1967	0.9406474820143885
1968	1.3920863309352518
1969	1.4388489208633093
1970	3.20139697322468
1971	4.190919674039581
1972	4.217694994179278
1973	5.190337601862631
1974	4.209276018099548
1975	1.21012101210121
1976	5.850272682201289
1977	7.344913151364764
1978	5.767741935483871
1979	7.027363184079602
1980	7.061691542288557
1981	4.323894684550423
1982	5.587680079483358
1983	5.049677098857427
1984	24.95678092399404
1985	9.693064436792916
1986	7.2431237721021615
1987	7.668958742632613
1988	6.527033609352167
1989	8.670238675109596
1990	7.4037993180711155
1991	7.270964614638875
1992	12.62135922330097
1993	8.169934640522875
1994	7.9113924050632916
1995	8.169440242057489
1996	6.026490066225166
1997	10.551876379690949
1998	10.132450331125828
1999	10.993377483443709
2000	8.7962472406181
2001	9.271523178807946
2002	18.414804081632653
2003	12.862746549983171
2004	16.67417176662587
2005	14.924824201320721
2006	17.839741060419236
2007	13.526441115702479
2008	17.392173768860882
2009	17.6463631422451
2010	18.507891710589362
2011	9.604813953488373
2012	8.914618165386353
2013	13.698078500292912
2014	19.22494370813738
2015	24.46189009159034
2016	29.427166035694967
2017	20.921162821357946
2018	20.41253151530744
2019	29.979296747456985
2020	29.28424190382728
2021	28.620685769092432