Year	kg per hectare
1961	805.8388462607986
1962	821.9907622251452
1963	821.698496045164
1964	789.5807689035937
1965	767.4113576345505
1966	771.993613619413
1967	919.2741767336145
1968	794.0324875837402
1969	802.2672907625248
1970	829.3235089988898
1971	900.76569211453
1972	917.2657863078443
1973	799.7136558051616
1974	1022.4669913936573
1975	1008.0008173541465
1976	953.1428499543314
1977	1016.4522817614736
1978	1031.6416674143193
1979	1007.4875404657752
1980	1064.4983779157897
1981	1239.7943357489746
1982	1075.8628400160417
1983	960.0978695333127
1984	923.4463385348904
1985	1055.7230558889764
1986	1050.0787409491888
1987	1035.156128281302
1988	1098.345801432926
1989	1130.6303659936648
1990	1052.494759289948
1991	1060.7318709948174
1992	905.9707602461567
1993	1081.7327009390244
1994	1028.8712241937897
1995	992.3176549244341
1996	1128.6114990102092
1997	1049.2683495063977
1998	1069.7325566589154
1999	1109.5339225429314
2000	1125.5059068612554
2001	1129.703256971041
2002	1132.7275803347356
2003	1113.2758631955294
2004	1191.1525183168192
2005	1159.3261205569033
2006	1236.4444692934517
2007	1212.0525973550132
2008	1288.041332702479
2009	1312.8361657985242
2010	1363.3140365371817
2011	1281.0175815999155
2012	1410.5630947061056
2013	1327.5633592030306
2014	1444.726372726804
2015	1448.9348091858678
2016	1410.5068640330294
2017	1522.6606092805198
2018	1535.1111479313554
2019	1540.785194561641
2020	1612.337482431778
2021	1619.332107213533
2022	1612.8834196052524