Year	kg per hectare
1961	2125.9558391180867
1962	2303.369526366128
1963	2383.9652314704213
1964	2323.7986725385194
1965	2517.753562603953
1966	2556.5291113695425
1967	2640.954335593632
1968	2700.7488717569363
1969	2818.546890294642
1970	2719.6471158908294
1971	3090.1676730727772
1972	3137.400705952193
1973	3109.1505942734457
1974	2889.293405023388
1975	3055.846781802311
1976	3073.2861492909824
1977	3182.7371249128364
1978	3495.7573132589696
1979	3529.130822455539
1980	3295.868393023541
1981	3506.4455311076536
1982	3638.1857636050872
1983	3227.4867322117466
1984	3826.7396399359363
1985	3922.845966723569
1986	3912.721729484267
1987	3889.2044992096476
1988	3525.46170015345
1989	3897.430088052965
1990	4089.8836596668652
1991	4050.643744668352
1992	4206.272573836452
1993	3850.1190640658087
1994	4414.604585449789
1995	4037.4013441944053
1996	4396.246406364194
1997	4429.013195743189
1998	4602.622337656809
1999	4634.396503522343
2000	4624.61337754464
2001	4578.123912896726
2002	4536.474717133522
2003	4448.504776135117
2004	5266.975281383984
2005	4893.046201575164
2006	4833.442520511586
2007	4895.495363874754
2008	5102.728901748904
2009	5279.808806273433
2010	5216.15284616798
2011	5277.588983695506
2012	4858.834538759089
2013	5582.405138202064
2014	5851.6084683931
2015	5675.099691948412
2016	6153.820516751238
2017	6079.174277307271
2018	5881.637546953639
2019	5929.845832146199
2020	5926.2688289178595
2021	5978.123011152168
2022	5874.428630566164