Year	kg per hectare
1961	1288.1950078203595
1962	1393.912448394578
1963	1525.2247495115241
1964	1612.131138915256
1965	1692.963408112101
1966	1776.7188781370987
1967	1828.5285259213852
1968	1849.8980988728788
1969	1859.2973367531395
1970	2051.8178591385604
1971	2088.3730223069215
1972	2026.0999097667564
1973	2163.012995410498
1974	2250.0183608548978
1975	2314.103414517396
1976	2367.274549102425
1977	2311.0078878075046
1978	2548.9026237516277
1979	2739.154605132585
1980	2705.3684194246907
1981	2834.632353318712
1982	3129.8782675809894
1983	3305.7728883065615
1984	3491.8746675070443
1985	3398.362551521583
1986	3458.045693594011
1987	3516.7513717890965
1988	3484.1865422833666
1989	3575.5480359050516
1990	3786.3883513467604
1991	3777.9243237812198
1992	3869.330334466032
1993	4007.429973694352
1994	3983.7009450701657
1995	4066.2820345313376
1996	4241.482077330493
1997	4193.671713740938
1998	4293.217595066821
1999	4288.008985294574
2000	4198.342829459664
2001	4249.174329840242
2002	4329.995099131822
2003	4330.556346452535
2004	4552.894759985952
2005	4607.209581425506
2006	4688.468336252735
2007	4717.3504614358735
2008	4899.306085966486
2009	4852.7748050624505
2010	4916.817500909998
2011	5058.149112088552
2012	5174.9564023008525
2013	5227.4945628970445
2014	5261.060983751747
2015	5361.987986452922
2016	5356.70607146512
2017	5414.716592754193
2018	5440.313129354389
2019	5534.695455341107
2020	5536.770840460975
2021	5575.739333775838
2022	5605.472401055992