Year	kg per hectare
1961	904.3191053145458
1962	1041.6851370575325
1963	1012.1917939177348
1964	1008.67482428666
1965	1079.9707727475939
1966	968.0738243558112
1967	947.5300033851724
1968	895.7781614011694
1969	927.1872804382531
1970	857.6664720918809
1971	998.9071654200948
1972	1010.4604118548705
1973	866.9307511389356
1974	1186.615643095632
1975	1126.519788987362
1976	1068.0190064272904
1977	1275.9971112570809
1978	1325.3224399976675
1979	1237.1041095463017
1980	1203.6582312541273
1981	1213.4061483087976
1982	1225.354351090761
1983	1168.9661255070046
1984	1331.0901766134145
1985	1345.4240843054558
1986	1289.8550468605126
1987	1221.342072570254
1988	1190.6385661186607
1989	1179.2038303640854
1990	1181.0300808407321
1991	1250.0010465358705
1992	1390.7474637751127
1993	1614.5814207486887
1994	1247.3906599927989
1995	1462.0675656021551
1996	1470.038865234724
1997	1453.2869199280158
1998	1474.4920163938907
1999	1338.8675611777935
2000	1383.7641532097718
2001	1521.0896832974072
2002	1345.5031088608787
2003	1469.9139383574816
2004	1502.2895799954597
2005	1586.480313982288
2006	1498.7849542450037
2007	1645.5542840811838
2008	1583.9776103350257
2009	1617.9920541997283
2010	1650.7325628567557
2011	1701.2986410400038
2012	1780.9761179894103
2013	2029.6581516498568
2014	1800.0374257475528
2015	2331.4867262787902
2016	1886.2912684513533
2017	2134.475126580416
2018	1838.8678660563414
2019	2700.6586070249864
2020	2385.3225527475015
2021	2134.2177747548026
2022	2422.5000230147994