Year	kg per hectare
1961	2177.90583580428
1962	2386.40248030469
1963	2465.3921690769566
1964	2402.395493282467
1965	2594.0442916605934
1966	2638.205859157611
1967	2720.0704273966803
1968	2777.778226327288
1969	2915.6194591134863
1970	2824.0017322596727
1971	3185.683279708786
1972	3223.319870284661
1973	3185.9778132890156
1974	2933.181234592225
1975	3133.427950142065
1976	3122.9847986513378
1977	3248.7077903886448
1978	3582.342910729192
1979	3644.883465311132
1980	3373.863646565425
1981	3605.5712578873477
1982	3721.4912652695452
1983	3273.713346286947
1984	3908.389849409369
1985	4004.45370467905
1986	3995.6946340092345
1987	3977.090138996118
1988	3566.061012459156
1989	3974.170484032772
1990	4176.999976217155
1991	4133.773760032939
1992	4241.467464715048
1993	3888.1209043702684
1994	4405.558022526866
1995	3963.541828085256
1996	4325.398660343425
1997	4349.884642829638
1998	4520.744597630456
1999	4530.393881866557
2000	4580.301764714091
2001	4506.511088665084
2002	4479.857335234684
2003	4383.361549185427
2004	5155.610688452065
2005	4795.496679916628
2006	4756.670905089267
2007	4811.702492406504
2008	5082.160892224868
2009	5207.5847152821825
2010	5086.68624170532
2011	5222.494417325731
2012	4808.969545536487
2013	5535.47471433062
2014	5820.256818930879
2015	5665.240927037883
2016	6155.176994615496
2017	5999.182174725755
2018	5883.045218695774
2019	5936.135678093401
2020	5865.511890606766
2021	5985.688586305659
2022	5871.2422837932845