Year	kg per hectare
1961	1951.5199161552132
1962	2207.96000608397
1963	2202.5237985319964
1964	2274.638315013088
1965	2339.348305946031
1966	2325.8561888054046
1967	2707.6357233575036
1968	2739.587216782577
1969	2741.7421609802855
1970	2625.48611917454
1971	3065.707110503005
1972	3070.060559790311
1973	3184.077847922629
1974	3261.5110440348512
1975	3140.569003699869
1976	2954.9666255135835
1977	3231.991661802283
1978	3587.169990671129
1979	3458.579588889687
1980	3776.344737605824
1981	3524.540871013246
1982	3773.665451759047
1983	3687.475816362492
1984	4443.380554952921
1985	4315.500142600712
1986	4091.781606303235
1987	4240.946899603618
1988	4507.360251991828
1989	4428.853471536208
1990	4489.04884955878
1991	4815.111762317151
1992	4387.606649136991
1993	4661.688512325351
1994	4626.361418054559
1995	4555.973360722841
1996	5164.1477190809765
1997	5040.906237360513
1998	5286.672225229652
1999	5160.509679236364
2000	5347.723470982155
2001	5220.012701329058
2002	5366.3839380254485
2003	4775.888541860509
2004	5862.315598360328
2005	5228.545724896938
2006	5248.245606233427
2007	5305.876365599193
2008	5786.118306250301
2009	5699.4102652953325
2010	5510.37545346084
2011	5611.63215941462
2012	5570.365600912191
2013	5832.910986430803
2014	6105.65089448584
2015	5992.852167533527
2016	5477.980547980173
2017	5750.560867427425
2018	5531.808839735434
2019	5923.347344430085
2020	5874.804030706569
2021	5936.424687341046
2022	5578.25764056774