Year	kilograms per hectare of arable land
1961	5.788888888888889
1962	7.738970588235294
1963	8.97069597069597
1964	15.938181818181818
1965	18.47826086956522
1966	12.194244604316546
1967	13.767025089605735
1968	14.02846975088968
1969	9.145390070921986
1970	9.602112676056338
1971	8.424561403508772
1972	10.487804878048781
1973	13.88888888888889
1974	15.931034482758621
1975	19.93127147766323
1976	27.191126279863482
1977	18.707482993197278
1978	27.27364864864865
1979	48.821548821548824
1980	48.16053511705686
1981	25
1982	50.351232691658225
1983	53.96052631578947
1984	70.81565299387081
1985	55.78034682080925
1986	28.359826589595375
1987	42.5973597359736
1988	88.1461038961039
1989	70.01366120218579
1990	93.75
1991	136.60642570281124
1992	60.45437042741625
1993	71.17903930131004
1994	66.35071090047393
1995	63.492063492063494
1996	106.38888888888889
1997	128.45454545454547
1998	123.32105263157895
1999	121.17894736842105
2000	108.5421052631579
2001	114.58333333333333
2002	154.35897435897436
2003	174.57627118644066
2004	46.411483253588514
2005	90.27027027027027
2006	55.78947368421053
2007	92.65858873841768
2008	102.34113712374582
2009	105.57768924302789
2010	130.63063063063063
2011	132.11845102505694
2012	108.29493087557604
2013	131
2014	92.56842105263158
2015	176.92847740236945
2016	112.33667706313749
2017	133.86096256684493
2018	114.04477611940298
2019	112.31378026070763
2020	84.7864077669903
2021	138.89558232931728