Year	kilograms per hectare of arable land
1961	4.661337654349422
1962	5.262649531199482
1963	6.186786061571012
1964	7.001779847023611
1965	7.502491031757353
1966	9.02931609751239
1967	11.104014598540147
1968	13.070485895042522
1969	14.327558001768118
1970	15.575973977126226
1971	17.894775826534882
1972	20.26350845123003
1973	21.357783081612634
1974	20.76153886714415
1975	25.083793348791357
1976	26.759151044639037
1977	30.44435601522599
1978	34.47482336065824
1979	35.64396571751452
1980	39.11707889156972
1981	42.28932393240613
1982	43.572069747757695
1983	46.115477060863014
1984	50.766032619542365
1985	53.89888532713705
1986	59.15233695643472
1987	56.82717525510731
1988	63.38608738317301
1989	64.91289873816436
1990	67.2801269609418
1991	67.55415373146975
1992	69.55031517429077
1993	69.28557661248463
1994	71.06069222660986
1995	73.48787260678534
1996	77.68124312607637
1997	82.75759907264538
1998	85.51935764530359
1999	90.13413018692457
2000	87.55553229109036
2001	88.7148497415759
2002	83.9129766473505
2003	87.57968899043333
2004	94.66830258916258
2005	99.08950677128423
2006	104.49254673310801
2007	107.53647402582124
2008	108.06911665228112
2009	116.19547660737682
2010	121.81561494599266
2011	123.8464806670095
2012	118.96772274182212
2013	119.0440907233521
2014	123.80916519570702
2015	125.04430147729117
2016	127.22121680660261
2017	133.6345212818461
2018	135.540817748473
2019	139.13536706526298
2020	151.9348477258946
2021	148.70615599667101