Year	kg per hectare
1961	2203.3029548754016
1962	2430.221366014941
1963	2580.2211379968057
1964	2378.6691922017326
1965	2731.875818755094
1966	2763.27392738539
1967	2781.5133828587213
1968	2858.920497838886
1969	3108.653907735493
1970	2960.731187165245
1971	3376.0369615977756
1972	3458.5666926812564
1973	3293.162356397431
1974	2733.7913050669567
1975	3178.522000349537
1976	3266.6396618448102
1977	3392.4351975638106
1978	3712.9383427875164
1979	3934.251216259715
1980	3425.2117898375054
1981	3840.1486848299965
1982	3955.5218146586444
1983	3178.8690714560903
1984	3842.10773654317
1985	4180.0323680384845
1986	4170.4845518866705
1987	4111.606533873253
1988	3186.7628773853294
1989	3888.920792449385
1990	4231.813490678294
1991	4023.066780168508
1992	4678.5111013958185
1993	3895.8180880004365
1994	4910.069813378108
1995	4189.30664855705
1996	4614.236287889396
1997	4653.065518670102
1998	5012.691412548312
1999	5125.631321676128
2000	5130.861611478292
2001	5053.2434310952285
2002	4846.748952005617
2003	5254.024261827035
2004	6029.282187728719
2005	5745.134413751884
2006	5623.094402575097
2007	5932.766051111402
2008	5914.836141568026
2009	6416.074094561494
2010	6329.8276820796755
2011	6174.018740034213
2012	5422.422577601863
2013	6635.49691413728
2014	6854.176946758975
2015	6676.542140193245
2016	7773.803115628059
2017	7419.097434678282
2018	7260.43869080045
2019	7103.774839141771
2020	7209.163333873061
2021	7134.4068736824065
2022	7119.331391817804