Year	kilograms per hectare of arable land
1961	2.640640981929765
1962	2.6542788953290146
1963	3.066271018793274
1964	3.283877349159248
1965	4.375159642401021
1966	6.0386334610472545
1967	8.180074257425742
1968	3.5748309320788003
1969	2.394101035456542
1970	2.514294790343075
1971	4.200991018891298
1972	4.8572313409724375
1973	7.03873132052455
1974	11.625112646440373
1975	14.242788461538462
1976	11.996392062537582
1977	14.95582586427657
1978	11.303234069804676
1979	9.28891736066624
1980	6.215956424223005
1981	7.788461538461538
1982	5.901218729955099
1983	5.969191270860077
1984	5.780346820809249
1985	6.012861736334405
1986	6.1795944641132925
1987	6.088917525773196
1988	7.553260167850226
1989	3.9948287007110537
1990	3.80012936610608
1991	5.593676421123444
1992	5.5847568988173455
1993	7.787151200519143
1994	8.14977973568282
1995	5.264868378290543
1996	6.714330121230961
1997	7.794417971409122
1998	9.534450651769088
1999	11.09480481361902
2000	11.499096929560507
2001	9.648273636656986
2002	11.794426229508197
2003	10.938608458390178
2004	12.711750920656177
2005	9.866282789507357
2006	2.307258632840028
2007	2.145964912280702
2008	2.303038674033149
2009	6.741436464088398
2010	8.610220994475139
2011	6.827575757575757
2012	10.524242424242424
2013	12.006060606060606
2014	11.384848484848485
2015	14.218878248974008
2016	19.1035540166205
2017	30.354600823045267
2018	14.661956521739132
2019	18.565593539703904
2020	21.565248000000004
2021	8.839140992167103