Year	kg per hectare
1961	1234.8260173042195
1962	1339.8163154897077
1963	1440.8202058523398
1964	1503.372639163611
1965	1567.1792485978367
1966	1660.2542762063788
1967	1726.585343631215
1968	1685.3709210419552
1969	1710.0651024892186
1970	1871.4529042953309
1971	1930.3867320605389
1972	1880.3694522246944
1973	1982.9816475622706
1974	2082.9034512130065
1975	2132.7854235232653
1976	2165.658042390668
1977	2162.1218752945165
1978	2347.512855990034
1979	2473.7451100975204
1980	2465.844677130039
1981	2618.1975559011184
1982	2777.648093878405
1983	2877.360166476641
1984	3063.690889988912
1985	2978.2912823091883
1986	3013.416815325373
1987	3073.486343705321
1988	3065.390075383038
1989	3141.070813909128
1990	3315.42819722991
1991	3305.428029667193
1992	2844.75679188421
1993	2885.657598426547
1994	2826.531717908252
1995	2909.9856260980873
1996	3084.1283365491126
1997	3171.3081784343867
1998	3281.8432817784937
1999	3311.24402668705
2000	3197.1289297356307
2001	3298.663870943723
2002	3321.9728634824305
2003	3345.191683367486
2004	3480.6924100347146
2005	3520.388813359618
2006	3630.6135097668994
2007	3683.6614075927714
2008	3899.902485471797
2009	3827.486808011403
2010	3948.83469901856
2011	4085.1844634116524
2012	4105.232021427064
2013	4248.317503786356
2014	4281.67749443069
2015	4417.355905929804
2016	4416.843788708398
2017	4628.574602379094
2018	4525.2901571365655
2019	4645.492379667381
2020	4649.020921217622
2021	4574.538004825028
2022	4768.962465543742