Year	kilograms per hectare of arable land
1961	5.982064556560746
1962	7.011358148548158
1963	8.333839007607411
1964	9.777095535091277
1965	11.888479099712903
1966	15.225413193810867
1967	15.629142395537277
1968	17.85281678272972
1969	20.104222307389
1970	23.011794344143297
1971	24.979966794050462
1972	28.399594914933928
1973	31.34514325594463
1974	29.665606438032583
1975	34.807746705731695
1976	36.161481277098574
1977	44.605244014204814
1978	49.69147402213511
1979	54.34621184686135
1980	61.12188183234304
1981	60.95997790393956
1982	62.92604966393802
1983	67.33880120451022
1984	73.03474506749116
1985	69.08244876199593
1986	73.64744544191544
1987	80.0280776888469
1988	88.5421200099725
1989	89.13200836835783
1990	93.20688158894858
1991	96.55451871199868
1992	85.4845857952321
1993	78.40782831749064
1994	81.32912094285204
1995	89.0242798298772
1996	92.8467547408618
1997	95.84523383559038
1998	98.00642517398809
1999	100.9369339096512
2000	98.15128893991992
2001	100.86210143867109
2002	104.970930403765
2003	107.74930623459632
2004	117.1297441998806
2005	119.2277082378618
2006	123.69455624847942
2007	130.239381001662
2008	127.37967110045484
2009	128.92804016740746
2010	141.67101519723795
2011	148.2544581196511
2012	145.49604000603713
2013	148.7806999315476
2014	154.26675995440277
2015	150.98937690465993
2016	151.7279555992966
2017	157.67569661057735
2018	156.2678996291657
2019	150.98107736449057
2020	161.45742770023529
2021	159.5767852428295