Year	kg per hectare
1961	813.1626413639095
1962	1105.4056577767553
1963	1036.8661373356117
1964	991.5213549694604
1965	1030.6597575130563
1966	921.2080036401456
1967	1009.5183493163801
1968	1162.4898446383324
1969	1078.017919317645
1970	1018.5350908036907
1971	1101.7518977277246
1972	1228.1734827487842
1973	988.4636622143106
1974	1110.804967766152
1975	1148.1077002273364
1976	1240.852778069375
1977	1041.787175513345
1978	1186.9174403562797
1979	1143.2304159473485
1980	1240.0056918054931
1981	1141.685132102975
1982	1276.291320666696
1983	1157.3824066945651
1984	1213.1755550680323
1985	1348.180614697997
1986	1496.4414806552977
1987	1385.3995383322097
1988	1644.747609401736
1989	1392.0791949973714
1990	1566.0363476292725
1991	1761.5472509358133
1992	1652.8135827028464
1993	1708.7753072104138
1994	1965.02063878328
1995	1835.3576053138625
1996	2012.9050223829697
1997	1900.951703055658
1998	1972.1470911478423
1999	1933.6549108121308
2000	1817.5478486994737
2001	2023.8446356090815
2002	2324.3698205569294
2003	2387.457313892627
2004	2347.7749668643773
2005	2192.433753196541
2006	2482.946253723289
2007	2249.829021670611
2008	2174.083607765505
2009	2479.957723595591
2010	2272.5791739337214
2011	2300.4710831879497
2012	2264.6001120102637
2013	2436.298463715542
2014	2372.773976284302
2015	2672.2792283608833
2016	2559.4127948813907
2017	2393.3280653305746
2018	2419.719931664618
2019	2464.4884766781256
2020	2244.994494146276
2021	2425.1719361106398
2022	2382.0998107695254