Year	kg per hectare
1961	1702.2591566835956
1962	1648.9688852762
1963	1730.8737202336517
1964	1763.0198204385465
1965	1997.1415381325264
1966	2132.0416255146138
1967	2167.648340286461
1968	2161.9540494628136
1969	2286.37653087507
1970	2126.7022497001844
1971	2567.784064579658
1972	2791.212712874619
1973	2820.457232349413
1974	2877.235501923196
1975	2810.4490492280197
1976	3107.4997050407214
1977	2962.2440981275486
1978	3144.387614194337
1979	2917.08140479664
1980	3076.524756442699
1981	3021.386945721198
1982	3449.9196391980527
1983	3201.139079019018
1984	3578.0361956793968
1985	3302.5376506365474
1986	3478.624321612946
1987	3356.6588627201504
1988	3446.120336405993
1989	3625.4939886604348
1990	3454.5877909744277
1991	3614.394965500657
1992	2518.9859658540345
1993	2772.994507080837
1994	2944.8572908211613
1995	3225.7967687441983
1996	2970.8651607768666
1997	3421.9971534932724
1998	3192.28311374895
1999	3288.7493476447535
2000	2662.670885740391
2001	3383.2658656478593
2002	3259.8623460521435
2003	2862.676355633544
2004	4128.801642681939
2005	3740.7450842351323
2006	3285.714928620498
2007	3009.3643364654995
2008	3911.425496881549
2009	3660.7090201965316
2010	3764.9820605101286
2011	4037.0793604077267
2012	3491.562283688203
2013	4149.561361684466
2014	4656.460742379867
2015	4255.412411117867
2016	4617.852834826324
2017	4868.755395939123
2018	4708.747909091727
2019	4843.275930307817
2020	4754.235908157566
2021	5106.540213236079
2022	4524.1033814477405