Year	kilograms per hectare of arable land
1961	2.6147588611272514
1962	3.1406304524834243
1963	5.694363742010459
1964	5.208333333333333
1965	6.175230716645779
1966	8.615594453284837
1967	10.856044328847677
1968	12.232415902140673
1969	14.721906923950057
1970	16.204594319339144
1971	12.922937648523254
1972	19.939340851855906
1973	19.933523162851824
1974	14.139853247179936
1975	23.55741469816273
1976	26.63088203107901
1977	37.3375314861461
1978	39.03671232876712
1979	44.675915771002416
1980	45.68446442276066
1981	43.915687781315185
1982	50.66772847100176
1983	59.78963582352294
1984	63.33707131192161
1985	59.07801573426573
1986	67.30225957864862
1987	76.42523010286952
1988	81.4163783160323
1989	94.93939076729824
1990	98.7332910321489
1991	107.02184336707512
1992	116.0137065861308
1993	111.16658829061839
1994	124.80578020932445
1995	142.19419324131366
1996	147.2448246978581
1997	132.20500595947556
1998	138.45516915069788
1999	161.8895211000474
2000	158.10754491017963
2001	174.59026857762254
2002	188.63916151702412
2003	160.2668935342732
2004	170.67137418641778
2005	197.74870433573506
2006	193.19010152284264
2007	184.41107983623337
2008	200.0640779187492
2009	188.85287326834273
2010	212.9639327429085
2011	255.76452201094034
2012	260.4432855280313
2013	254.6001562907007
2014	279.22023731907683
2015	298.96640559527384
2016	289.4022701601322
2017	303.71274652489967
2018	318.4668630907196
2019	316.02108698380823
2020	320.9125
2021	384.209617755857