Year	kilograms per hectare of arable land
1961	1.378646173969915
1962	1.3479960899315737
1963	2.2209567198177678
1964	2.73
1965	2.1972256857855363
1966	3.4666460012399254
1967	5.893840916125039
1968	7.64289284598563
1969	10.075671250818598
1970	9.224951140065146
1971	12.597229551451187
1972	14.38233355306526
1973	12.902274911887215
1974	13.93711103832296
1975	17.982175324675325
1976	20.72554169402495
1977	23.407310704960835
1978	28.24398073836276
1979	31.77159420289855
1980	33.625163500467146
1981	34.65487804878049
1982	37.54725407362704
1983	38.79826030927835
1984	39.02223606353161
1985	47.65433617155472
1986	59.230258792302585
1987	55.0464
1988	58.13475935828877
1989	62.15471884248603
1990	63.62685714285714
1991	63.20472995639047
1992	71.78860294117646
1993	71.01488587495865
1994	72.18419834710744
1995	82.57137229152987
1996	78.98458265139116
1997	85.67442010309279
1998	82.84228791773779
1999	91.06396657023465
2000	95.44136597938144
2001	94.07188498402556
2002	97.7847533632287
2003	100.97018275088169
2004	110.7789508413065
2005	123.483460391117
2006	125.73024406332453
2007	118.42349237905898
2008	119.15465037338764
2009	144.32743031951054
2010	138.30472949982988
2011	128.52269102990033
2012	117.36236772486772
2013	135.70259271414506
2014	134.85413929040735
2015	137.4715789473684
2016	144.56295579219102
2017	152.47894905479012
2018	152.72362002567394
2019	152.38529315427448
2020	155.15088910442935
2021	157.28669288757786