Year	kg per hectare
1961	1120.8111086178724
1962	1169.9284281456528
1963	1232.7123342380016
1964	1266.1585185395083
1965	1263.6358695331899
1966	1302.223318231411
1967	1378.449207899802
1968	1380.9949571010147
1969	1389.5616884831024
1970	1479.1477339181442
1971	1531.9411682983675
1972	1516.470422978208
1973	1557.7005332258937
1974	1612.661834156791
1975	1690.4539520727478
1976	1706.4135676731398
1977	1720.980506627065
1978	1830.5416037563443
1979	1849.357655921354
1980	1893.7085825813228
1981	1979.6685362248827
1982	2068.371265611824
1983	2148.2020868681952
1984	2228.888525959516
1985	2196.8794613185873
1986	2223.88358428537
1987	2236.4518739503037
1988	2289.6555644189207
1989	2345.700208552678
1990	2426.4483261832047
1991	2436.2735735562346
1992	2335.2636350777293
1993	2402.713475158894
1994	2343.6156047223444
1995	2402.417609914436
1996	2494.1528321094147
1997	2556.481405749703
1998	2587.3295364586875
1999	2643.7074818426445
2000	2580.2210083321065
2001	2698.526455167008
2002	2683.8722166759353
2003	2685.3844265303032
2004	2821.439579385782
2005	2801.299714671684
2006	2878.9005336382215
2007	2924.639507023759
2008	3083.859620694401
2009	3066.6002290142264
2010	3098.00432488236
2011	3234.8800997578664
2012	3262.2197783725383
2013	3355.8674413391795
2014	3397.9846085765184
2015	3470.2657512198216
2016	3468.95574821279
2017	3604.5780966845045
2018	3600.450247600424
2019	3700.577076139202
2020	3672.8444044696157
2021	3724.445459703529
2022	3783.5842416454766