Year	kilograms per hectare of arable land
1961	123.58971743343875
1962	134.48136200716846
1963	148.14227704960163
1964	161.1905860153056
1965	164.8894445626729
1966	182.9679358717435
1967	210.0323633547245
1968	230.04044598668867
1969	239.3665243381725
1970	267.06384566802546
1971	290.8025914634146
1972	311.35056087390615
1973	340.83896817969116
1974	269.46984604699617
1975	270.3686609357872
1976	298.0211312824704
1977	302.91340863017666
1978	323.7192416296894
1979	339.319579334521
1980	321.0107600732601
1981	317.79071094374075
1982	315.61951164239986
1983	330.12620974588265
1984	324.55500028075693
1985	317.7314065725604
1986	326.26958550950104
1987	320.2675180271922
1988	336.8158086790546
1989	344.6320984308212
1990	319.53128514236874
1991	312.09165904897566
1992	253.82559436092544
1993	255.2983841453271
1994	260.39721046407533
1995	270.410661912387
1996	278.16533919252953
1997	273.05816607462464
1998	264.0572114859701
1999	258.9971176531485
2000	225.82051170291592
2001	227.73480723213362
2002	211.28378194486024
2003	223.36391570597337
2004	212.10801393728224
2005	192.4625631203204
2006	190.38257265935982
2007	209.33818945434263
2008	152.44653423615256
2009	120.5634250282096
2010	150.53795756446473
2011	141.29930394431554
2012	160.7863054311142
2013	169.41739458201545
2014	168.42672543105095
2015	170.40094811864472
2016	163.13912092428404
2017	177.62482732281046
2018	170.97079398005118
2019	156.6553776322344
2020	173.35692359783835
2021	153.3236321433504