Year	kg per hectare
1961	805.8388462607987
1962	821.9907622251452
1963	821.698496045164
1964	789.5807689035938
1965	767.4113576345507
1966	771.9936136194128
1967	919.2741767336142
1968	794.0324875837402
1969	802.2672907625248
1970	829.3235089988897
1971	900.76569211453
1972	917.2657863078443
1973	799.7136558051617
1974	1022.4669913936575
1975	1008.0008173541466
1976	953.1428499543313
1977	1016.4522817614734
1978	1031.6416674143188
1979	1007.487540465775
1980	1064.4983779157897
1981	1239.7943357489748
1982	1075.862840016042
1983	960.0978695333127
1984	923.4463385348904
1985	1055.7230558889764
1986	1050.0787409491888
1987	1035.1561282813022
1988	1098.3458014329258
1989	1130.630365993665
1990	1052.494759289948
1991	1060.7318709948174
1992	905.9707602461566
1993	1081.7327009390247
1994	1028.8712241937897
1995	992.3176549244341
1996	1128.611499010209
1997	1049.268349506398
1998	1069.7325566589154
1999	1109.5339225429311
2000	1125.505906861255
2001	1129.703256971041
2002	1132.7275803347359
2003	1113.2758631955292
2004	1191.1525183168192
2005	1159.3261205569033
2006	1236.4444692934517
2007	1212.0525973550134
2008	1288.0413327024792
2009	1312.8361657985242
2010	1363.3140365371821
2011	1281.0175815999157
2012	1410.5630947061056
2013	1327.563359203031
2014	1444.7263727268037
2015	1448.9348091858683
2016	1410.5068640330296
2017	1522.6606092805202
2018	1535.1111479313552
2019	1540.7851945616403
2020	1612.3374824317777
2021	1619.3321072135325
2022	1612.8834196052524