Year	kilograms per hectare of arable land
1961	46.64923143383018
1962	42.01770334230993
1963	48.67514689351607
1964	59.59730781221165
1965	62.68801180671209
1966	60.072722783352305
1967	56.61041813805891
1968	53.30761402575627
1969	53.378012393942484
1970	52.51600620798747
1971	63.349884321053565
1972	76.72364638939403
1973	102.76031894934334
1974	58.656448775206385
1975	55.32021292271421
1976	72.51156440022112
1977	72.07533382739338
1978	72.82103937481216
1979	74.79073827446439
1980	69.50256437647587
1981	66.7682376824317
1982	59.32752661626292
1983	62.025762377266354
1984	57.75883895303373
1985	55.37160711730191
1986	58.06463074914155
1987	70.89937091836735
1988	77.35873731804146
1989	79.87899070006276
1990	68.91702878037273
1991	74.98328161320316
1992	87.78951374337483
1993	88.71273858921163
1994	97.13859384632629
1995	111.39165290728752
1996	105.46420569999479
1997	104.92009854573287
1998	105.79497798594848
1999	102.71638992780726
2000	97.31602948067993
2001	102.18882190082644
2002	95.46830629871498
2003	93.53500258175559
2004	94.48304043817735
2005	83.93220210590107
2006	85.59817442628363
2007	89.32765837837837
2008	78.09510629696466
2009	60.92792539865005
2010	77.03853624703274
2011	68.11520907149098
2012	69.42181816457737
2013	72.83572169835494
2014	79.61052649693525
2015	79.4678591990531
2016	89.08681006088433
2017	89.3249817898023
2018	85.8700936269129
2019	84.48998658947437
2020	84.29422921289648
2021	82.6199379497841