Year	kg per hectare
1961	1271.9292148215693
1962	1334.1793412716002
1963	1308.5598260292709
1964	1387.8255058482926
1965	1361.9990060710904
1966	1366.0195205632888
1967	1429.0962394244636
1968	1347.1769773188746
1969	1412.7631241575925
1970	1533.1272381861666
1971	1494.774260717153
1972	1445.2893008340257
1973	1611.3525592903627
1974	1662.0510299055393
1975	1627.2303136478067
1976	1632.070087090323
1977	1695.087276038717
1978	1713.5377098978374
1979	1729.0443112354571
1980	1800.2253929133062
1981	1997.1831016994774
1982	1988.824496790627
1983	1984.8508007674075
1984	2097.1833780915176
1985	2140.7801440984076
1986	2036.938639627211
1987	2098.6164710770895
1988	2094.0745229018607
1989	2111.2236711979576
1990	2091.4144905007524
1991	2143.4612699442678
1992	2420.072554643125
1993	2525.0806383229015
1994	2431.4532083546246
1995	2566.427261227468
1996	2513.9048226222976
1997	2659.9165530820505
1998	2847.0293671838976
1999	2810.0091526102033
2000	2849.635258893517
2001	3042.4759151906906
2002	2940.039070819541
2003	3189.731503582188
2004	3188.4084414492745
2005	3206.2542412290168
2006	3265.4682106057166
2007	3540.6058866341214
2008	3656.8468359686067
2009	3334.0330155454126
2010	3853.3161217157585
2011	3809.498796607264
2012	3963.3385445876884
2013	4159.7679173834495
2014	4169.475381704208
2015	4353.657093136729
2016	4183.992339090743
2017	4680.83689906231
2018	4339.244457745625
2019	4851.894525942296
2020	4714.578938801408
2021	4433.533556484331
2022	4586.633974212447