Year	kg per hectare
1961	1415.8103231942112
1962	1512.8537844423317
1963	1628.773991234613
1964	1710.9795512631022
1965	1759.2696193732947
1966	1865.1017378665415
1967	1874.339699692656
1968	1925.3482943301756
1969	1920.2469088343826
1970	2098.627166708097
1971	2117.4586645482746
1972	2048.4378927308703
1973	2193.0190840144974
1974	2282.9745795710082
1975	2347.5306129714777
1976	2382.551378221597
1977	2302.9633006717618
1978	2570.9533580908455
1979	2713.8763333189395
1980	2604.4703793601225
1981	2755.5660091080517
1982	2964.3660800161906
1983	3175.933995086969
1984	3355.2167704737253
1985	3260.097224058639
1986	3335.274936610561
1987	3392.4578819923104
1988	3388.5834298138975
1989	3477.8325857222185
1990	3668.7110500685217
1991	3649.493197895849
1992	3756.187087583184
1993	3847.093244904198
1994	3870.101335536478
1995	3893.3956812397273
1996	4073.5965637569557
1997	4037.385521171359
1998	4098.264419065942
1999	4094.6209021919753
2000	4025.499607845784
2001	4036.4036063808558
2002	4129.682196293719
2003	3986.35096616838
2004	4277.8549657565545
2005	4275.786867329187
2006	4414.958515282899
2007	4333.916191542731
2008	4502.304510937165
2009	4495.2207038406095
2010	4560.4522450242375
2011	4753.888144955862
2012	4870.299968319944
2013	4903.88109221868
2014	4962.1960241518955
2015	5046.047551192794
2016	5066.087992597836
2017	5150.362991060852
2018	5143.751907467194
2019	5194.163035398656
2020	5191.837063639828
2021	5259.16625911339
2022	5322.835090136861