Year	kg per hectare
1961	804.158384894838
1962	1102.2990783692094
1963	1032.2898223470038
1964	978.9029221117073
1965	1020.4943886453034
1966	914.3049627789816
1967	998.2055664493789
1968	1160.8835705450788
1969	1072.9123765071806
1970	1014.0204648398786
1971	1104.4045231183457
1972	1223.0540355614633
1973	984.8504214885385
1974	1109.528891610502
1975	1146.433454377571
1976	1247.228240074486
1977	1041.3406852683258
1978	1192.3272535405144
1979	1148.7309377950724
1980	1245.8644083184088
1981	1137.9780621706077
1982	1267.8853362848336
1983	1126.7125706602064
1984	1173.3745616881506
1985	1296.0871230983118
1986	1435.423787303747
1987	1303.718087571237
1988	1553.648401540727
1989	1293.532055102502
1990	1471.1481665269544
1991	1669.1984776044935
1992	1553.5392519712352
1993	1599.2802057123124
1994	1865.9716624734147
1995	1778.2281179860126
1996	1983.3519292042874
1997	1856.693007656033
1998	1936.2888835884507
1999	1887.9256545401388
2000	1770.359396145002
2001	1971.3657005029959
2002	2274.6253965345973
2003	2338.0474685745266
2004	2290.2726487722553
2005	2135.2143328584207
2006	2429.390419245989
2007	2189.738195112225
2008	2111.6478869288003
2009	2447.1039250255335
2010	2234.9476927909936
2011	2264.066877858293
2012	2234.4853582496353
2013	2411.9316309240216
2014	2331.9823019494356
2015	2630.261521229234
2016	2519.155048850264
2017	2356.8640124381914
2018	2385.3203361743135
2019	2435.3752373615303
2020	2210.4374525731546
2021	2399.5529902060607
2022	2346.2517446657175