Year	kilograms per hectare of arable land
1961	3.2496849606744016
1962	3.2047468764861007
1963	4.567357187696171
1964	4.044199126930826
1965	6.2515834067362945
1966	7.926041666666666
1967	11.700578956200705
1968	15.774904532624937
1969	17.675201141452973
1970	17.373855523736538
1971	19.799423492673554
1972	24.768310327298323
1973	28.289550953294444
1974	20.776320496005724
1975	35.77846475028103
1976	47.42148660606548
1977	50.23037944380162
1978	61.654698881503
1979	50.39549228023896
1980	57.42675711919224
1981	50.89353686771573
1982	60.32319517335427
1983	70.20826299797434
1984	62.890866051750876
1985	58.015856881479976
1986	61.857602410619755
1987	71.21663195000801
1988	65.11772774953603
1989	72.27387459807073
1990	76.58213981417617
1991	71.79376469634315
1992	78.63066003100269
1993	90.15154609697316
1994	61.01343857518721
1995	68.97006570941835
1996	73.3988741127519
1997	75.14096390500885
1998	89.2303285731822
1999	90.33942913629062
2000	87.66943674976916
2001	70.19184067896308
2002	72.79594898724682
2003	84.29466883450283
2004	85.62753969251393
2005	86.75933697020562
2006	91.83734389278099
2007	90.34046134946995
2008	71.97248898167479
2009	104.56615615193668
2010	98.37565469509914
2011	89.94113637470178
2012	100.34640618165913
2013	112.38135510838923
2014	105.33078892700131
2015	106.67002421307507
2016	137.7332940830144
2017	132.22987298729873
2018	109.72762764285352
2019	125.96608784473953
2020	149.64204023281937
2021	129.52799154972084