Year	kg per hectare
1961	1278.7212387659245
1962	1344.5803536940978
1963	1314.4651833325624
1964	1389.5189373928963
1965	1364.8509406881394
1966	1363.6696070316748
1967	1432.092237743113
1968	1345.359924143224
1969	1418.5303137965677
1970	1535.3985317870795
1971	1495.6048211809941
1972	1442.7849348912212
1973	1619.9139143333628
1974	1665.275238626035
1975	1632.9351617057232
1976	1644.1742678169055
1977	1690.5284932404288
1978	1714.2933142740346
1979	1718.7831858455986
1980	1793.9691818105694
1981	1998.8634512976198
1982	1985.2513535001137
1983	1982.8024868739524
1984	2089.9614962361215
1985	2133.140434509495
1986	2018.5683024014977
1987	2081.005922111749
1988	2065.122315350718
1989	2069.4164510821715
1990	2055.1813932611517
1991	2102.7764266685313
1992	2387.6697105705884
1993	2494.680542247046
1994	2390.0541999808197
1995	2524.892521580266
1996	2467.7885134321364
1997	2619.1631763059636
1998	2803.9847469585766
1999	2771.6742653736533
2000	2811.1579473634215
2001	3008.222500784416
2002	2897.1096767015615
2003	3154.029079322902
2004	3135.382778307047
2005	3152.190039286275
2006	3210.4945201011756
2007	3507.9066036642776
2008	3630.668485334688
2009	3299.9981726293304
2010	3823.525443367025
2011	3771.965471575855
2012	3942.1526082346345
2013	4140.160958328953
2014	4146.564494313454
2015	4341.779179371074
2016	4154.521250927187
2017	4676.024321928379
2018	4331.663650306486
2019	4843.945536253616
2020	4707.79024900249
2021	4414.611033461546
2022	4589.545627600322