Year	kilograms per hectare of arable land
1961	55.11487834064619
1962	51.58489812225329
1963	62.13405362144858
1964	79.76432865731464
1965	66.59935768767564
1966	53.38761560112585
1967	71.96455900120822
1968	73.08632513110125
1969	81.8319191919192
1970	52.242007284500204
1971	54.10944466963924
1972	93.12992285830288
1973	96.34947111472742
1974	86.58866693844273
1975	99.95915032679738
1976	101.59721653704462
1977	110.76045939294504
1978	101.80805589806823
1979	113.3496705107084
1980	106.8815517952951
1981	113.66211745244003
1982	106.95358474927477
1983	93.27699335548172
1984	90.13732833957553
1985	100.79232693911592
1986	112.57835353113246
1987	116.87604690117253
1988	123.58371800251784
1989	115.2228763666947
1990	118.77133105802048
1991	111.73668254655695
1992	106.37362637362638
1993	111.60714285714286
1994	112.72727272727273
1995	113.3302368787738
1996	129
1997	125.39851222104144
1998	140.11676396997498
1999	138.19241982507288
2000	125.12355236620635
2001	127.7201945276809
2002	120.40460837942732
2003	119.6587794804493
2004	117.35110235848738
2005	127.92425658388613
2006	137.0608984167378
2007	203.4034400174178
2008	155.48880930331663
2009	118.56567136838248
2010	148.9573620781303
2011	132.5053027680893
2012	150.86045808047552
2013	167.58921748601242
2014	191.03952173239963
2015	185.72819544655874
2016	187.36241002616495
2017	182.78908393238004
2018	182.31908907669384
2019	183.53906194328573
2020	180.818026921934
2021	175.80018186269294