Year	kilograms per hectare of arable land
1961	2.1712899374863612
1962	2.885768985322272
1963	3.4539912364259857
1964	4.9019856465397
1965	4.959043333164788
1966	6.939907938709881
1967	9.631993991738641
1968	10.999631408954889
1969	12.389358403760564
1970	14.05455904334828
1971	16.630361300984
1972	17.279287827900067
1973	17.6256178435707
1974	15.93364746967511
1975	21.588254921588256
1976	21.083939601498237
1977	26.507629937245078
1978	31.43243955182279
1979	32.261202613739265
1980	33.9727608778415
1981	37.348998232174424
1982	35.93043627408941
1983	40.77563109898483
1984	48.89070884621496
1985	52.98642533936651
1986	58.855999363560144
1987	51.11791918139763
1988	66.09647076159835
1989	69.21077100002447
1990	73.52302412225696
1991	77.99931977791668
1992	74.70166435165267
1993	76.17673723444823
1994	83.45589293954777
1995	85.70285527234098
1996	89.04232883092688
1997	100.1725608133613
1998	104.06795160121183
1999	112.17102034477404
2000	103.78611818803206
2001	108.18219865897396
2002	100.32905530068814
2003	105.17720386235207
2004	115.27151007320846
2005	127.61459195705075
2006	136.40392154391097
2007	142.83522547493388
2008	153.34939080350645
2009	167.45729591449052
2010	179.03587692425276
2011	180.74829117270463
2012	163.12202164220102
2013	156.49569808619168
2014	163.4980794181372
2015	171.0382129362649
2016	166.0030578887773
2017	170.5691446332232
2018	176.07131343564296
2019	186.45666609626574
2020	210.6573795334594
2021	193.24504071753677