Year	kilograms per hectare of arable land
1961	33.51263574545823
1962	10.260028220116912
1963	19.029737135897697
1964	19.16149384349242
1965	27.144895047890767
1966	34.33704195161784
1967	44.97397693642208
1968	49.46412166989895
1969	55.07112885068059
1970	61.060310284598785
1971	65.11101973684211
1972	65.78811901575209
1973	88.42410436943466
1974	94.9294032773369
1975	122.84159737193306
1976	117.25409836065573
1977	115.54033329925366
1978	150.97419157400796
1979	145.76754609351124
1980	124.3949562741509
1981	164.28063762818562
1982	169.6048632218845
1983	166.09450726978997
1984	171.6155007549069
1985	155.5332999499249
1986	138.53073463268365
1987	137.8968253968254
1988	134.0654991589987
1989	145.69676464368789
1990	128.3068783068783
1991	49.135094980367185
1992	59.10013893341883
1993	64.44706134246869
1994	40.05782203662062
1995	38.92042411909607
1996	45.196529934668526
1997	33.70425850631286
1998	38.605898123324394
1999	25.396485212173168
2000	32.43566783924955
2001	39.42129975456194
2002	34.78274317406143
2003	38.632824997333906
2004	42.62523836231071
2005	51.3513633834168
2006	40.59559234813737
2007	44.63585014409222
2008	45.63524825134732
2009	48.49323017408124
2010	52.54624972665646
2011	54.13496386881601
2012	49.78085928620141
2013	56.23496455522525
2014	51.51959444064707
2015	60.68603326498064
2016	59.90748077371242
2017	68.06391197471615
2018	83.20112825236012
2019	83.59926388579076
2020	87.0509253801721
2021	107.41581276199348