Year	kilograms per hectare of arable land
1961	67.79505520136837
1962	69.36248534583822
1963	68.76463626321603
1964	74.63962533735514
1965	86.39548067709997
1966	89.30376084860174
1967	90.61078375978691
1968	93.92629191641018
1969	100.74257425742574
1970	111.6701435246996
1971	152.4303438124277
1972	164.0920898541467
1973	152.0059216192937
1974	136.5027363451014
1975	159.670525187567
1976	153.20418624519436
1977	191.75659792712898
1978	236.8552534123373
1979	248.49303503588013
1980	222.66002319940947
1981	217.26780054933445
1982	211.83611757242545
1983	226.16542506573182
1984	229.81510388040013
1985	237.52475138121548
1986	236.2195685670262
1987	251.1322669608384
1988	233.53215003348961
1989	201.5922384076504
1990	215.75454948956946
1991	223.22359550561796
1992	219.65714285714284
1993	222.6783625730994
1994	227.1821347100492
1995	219.9686104068574
1996	223.83581373019683
1997	213.01344965467104
1998	209.86913194861327
1999	208.77706260971328
2000	204.2693713881354
2001	168.5949154574889
2002	171.1218776396766
2003	177.7024751853248
2004	181.4180975059531
2005	171.75308483290488
2006	177.0315889370933
2007	190.22995398131363
2008	143.47626033608964
2009	120.11158859762212
2010	122.74595285430276
2011	134.32247023809524
2012	122.50632200056195
2013	129.30350080562474
2014	126.56406064209274
2015	134.1269504620512
2016	131.5006719426609
2017	130.43524086772055
2018	129.8369775397888
2019	128.00514536569253
2020	129.28340278806024
2021	133.21888713343264