Year	kg per hectare
1961	2021.4162472871255
1962	2195.363087900595
1963	2278.5618473300087
1964	2206.13324530903
1965	2375.216513758366
1966	2409.998758104038
1967	2499.6569241920906
1968	2558.155059922601
1969	2669.246239516525
1970	2568.5294702857414
1971	2925.8858251446422
1972	2936.53220181818
1973	2918.253841132422
1974	2736.5923582084442
1975	2912.666581758924
1976	2920.1775950276738
1977	3020.728420183971
1978	3317.0953905840806
1979	3367.141041494865
1980	3153.821988307754
1981	3358.1657401923567
1982	3478.0796187995857
1983	3072.892469634369
1984	3640.4606826785125
1985	3723.520656543776
1986	3721.374267771382
1987	3694.4995256465254
1988	3345.4333243415754
1989	3663.2957684741205
1990	3877.110988147898
1991	3837.232292852508
1992	4024.2084027406127
1993	3693.6711373856933
1994	4154.097492268868
1995	3812.6599160008086
1996	4167.74515293449
1997	4185.8463100360095
1998	4375.869195953917
1999	4364.935797725334
2000	4426.966183050465
2001	4335.781731272911
2002	4317.878444960917
2003	4251.164117719825
2004	4958.0949666080205
2005	4665.517113161628
2006	4610.622245460227
2007	4716.960328994825
2008	4892.822277077543
2009	5081.455698214172
2010	4986.906367526006
2011	5035.916704133312
2012	4728.272314395981
2013	5350.760066421725
2014	5561.70132027249
2015	5448.500020474601
2016	5862.864737285738
2017	5764.966499624559
2018	5562.405162127689
2019	5639.4219418721095
2020	5694.872887547448
2021	5667.994107837404
2022	5668.8141204263065