Year	kg per hectare
1961	1421.619314413351
1962	1510.8631936906513
1963	1576.0941040595567
1964	1576.946325117763
1965	1625.014969154917
1966	1665.7642100833218
1967	1748.6653014239166
1968	1765.7077356630248
1969	1789.4100389355801
1970	1816.3886234858633
1971	1965.6043414343994
1972	1953.469567402063
1973	1985.4378856929409
1974	1966.8677468754645
1975	2080.3896368213886
1976	2088.6776925136164
1977	2135.9346717779576
1978	2296.3669451594333
1979	2331.575509925803
1980	2297.408449743149
1981	2438.7213567994813
1982	2534.2880040777804
1983	2443.6247664327198
1984	2691.7911832656205
1985	2695.3594708180376
1986	2690.086521294144
1987	2677.4875226392355
1988	2600.408101858725
1989	2754.9956663382936
1990	2870.9491318841324
1991	2859.4172697199065
1992	2775.591612336837
1993	2735.201253704066
1994	2818.809958751589
1995	2758.0860917515447
1996	2938.759949652844
1997	2987.7859704943803
1998	3060.0874164657916
1999	3099.407411871992
2000	3069.1889245938632
2001	3126.78362014272
2002	3101.7667102697274
2003	3094.621704496169
2004	3373.077844103067
2005	3262.695741296
2006	3307.428616462562
2007	3373.1392426117777
2008	3537.64309891583
2009	3555.4766270911655
2010	3546.90743044674
2011	3656.0464809851874
2012	3614.7924624156794
2013	3822.7962752171384
2014	3896.249288002097
2015	3928.000854852105
2016	4008.427394185337
2017	4075.0440669067693
2018	4035.038574778137
2019	4131.819598130346
2020	4100.768039365954
2021	4152.2327183892685
2022	4182.3829704231275