Year	kg per hectare
1961	987.4774044700304
1962	984.2394286968312
1963	1011.8357970163155
1964	1015.536177033929
1965	989.5096708441056
1966	950.2403648222025
1967	1032.5798847101992
1968	1059.6066640129172
1969	1059.4180525272943
1970	1054.2245708187327
1971	1049.6015621731317
1972	1065.4274645909666
1973	1070.7821125145929
1974	1151.5709665565344
1975	1195.6430131142417
1976	1175.6460975378357
1977	1203.2395108058806
1978	1228.1564717274575
1979	1245.347290188131
1980	1342.236827910232
1981	1414.269586703119
1982	1377.3624658682988
1983	1399.1673387478418
1984	1324.837696648426
1985	1372.1708980467808
1986	1389.2595873401115
1987	1350.7633920264398
1988	1406.2316033717157
1989	1389.1954085239481
1990	1387.2124604157702
1991	1379.821460102652
1992	1374.9047381534467
1993	1454.532930273471
1994	1360.3081068108752
1995	1447.0618722322322
1996	1500.9471862302564
1997	1438.2037509495003
1998	1517.6097598305794
1999	1598.1429366023488
2000	1637.790466098031
2001	1650.7349222233854
2002	1674.6061704560238
2003	1669.604667528241
2004	1737.6378088199087
2005	1732.39116188152
2006	1839.3709914677452
2007	1878.5098378157338
2008	1871.9182577394754
2009	1983.4860203147182
2010	1965.691393030409
2011	1942.76994436639
2012	2022.0223878051772
2013	1981.2598029476496
2014	2033.1062816854267
2015	2108.8016952049766
2016	2042.7745985386005
2017	2105.9469344823024
2018	2134.1915112215224
2019	2199.356152955933
2020	2226.1036532136604
2021	2231.8610529008297
2022	2213.9515878021493