Year	kilograms per hectare of arable land
1961	7.056299132368559
1962	7.612009931308425
1963	8.972277325203779
1964	10.194194835555654
1965	12.329041049647078
1966	15.512160223573765
1967	16.344289868211973
1968	18.62269862553378
1969	20.94408933357767
1970	23.91339914663772
1971	26.280061592076947
1972	29.522687261560108
1973	32.706638638442506
1974	31.576920238566498
1975	36.53231827415853
1976	37.595777447267814
1977	44.54026699340643
1978	49.262088391964035
1979	53.87501145428166
1980	58.60264337367056
1981	58.61100471068802
1982	60.565343702683485
1983	64.72262884043225
1984	69.4404537412959
1985	66.24185827603053
1986	70.18049890111664
1987	75.59388463549925
1988	83.1986613289187
1989	83.42958016266411
1990	84.38368411987845
1991	85.85478955992971
1992	78.84968625474605
1993	72.56947449461065
1994	75.70425126957126
1995	82.41961475069701
1996	85.28144649119815
1997	88.47415521714807
1998	89.54660060635459
1999	92.00454186558795
2000	89.7881795631947
2001	91.95955986248728
2002	96.26961780559263
2003	97.96273480531393
2004	106.52543197533457
2005	108.5017533534989
2006	112.13953332743553
2007	118.27225034436046
2008	115.57597396846491
2009	116.02932031702571
2010	127.3140292089392
2011	132.70246138623537
2012	129.49909562769577
2013	132.1589943988046
2014	136.53630366417033
2015	133.85036911515786
2016	134.61242827600844
2017	139.55887957911418
2018	138.07328348639157
2019	133.319810528665
2020	142.55368563426072
2021	141.0316324106975