Year	kilograms per hectare of arable land
1961	8.874527699286762
1962	9.620037720553515
1963	11.320350205587966
1964	13.1422203040432
1965	16.018631084100907
1966	20.33642896836104
1967	21.162027025863843
1968	24.13553285189121
1969	27.10929513946918
1970	31.15960795741015
1971	34.04562633290221
1972	38.23024658037303
1973	42.60497074864307
1974	40.894846285448494
1975	47.321678752768285
1976	48.330195215607326
1977	57.38418993251243
1978	63.58503021384379
1979	68.76073640030587
1980	75.66802375939568
1981	75.21777898505933
1982	77.24265549511153
1983	81.93260960759248
1984	88.63721499995928
1985	83.59506050300898
1986	88.0844699960057
1987	96.10028751730718
1988	106.18408500990488
1989	106.3217553080189
1990	107.6580777400477
1991	109.6145110169147
1992	93.59670300918575
1993	86.00671783035313
1994	89.61771654268398
1995	98.28426676559079
1996	103.14841535065688
1997	105.93817561903285
1998	108.37327076296513
1999	110.84613874613285
2000	107.93802448816224
2001	111.255399760895
2002	116.30833955329632
2003	120.16192364198201
2004	130.84182354614785
2005	133.17244785356687
2006	137.98584236855444
2007	146.71727608381158
2008	143.5533142204845
2009	144.0830326428406
2010	158.99350872257227
2011	166.11267604029857
2012	163.30790048411964
2013	166.89214365853988
2014	172.35041416220875
2015	168.8043925068535
2016	169.32823557028945
2017	174.84454471070873
2018	173.30050823627917
2019	165.9272581493705
2020	177.3744504343512
2021	175.69848880362576