Year	kg per hectare
1961	1018.980300153036
1962	991.8776125670784
1963	1039.4064896431987
1964	1061.7480811534415
1965	949.0564156585634
1966	940.8883166305973
1967	1066.730961216826
1968	1122.4272774745646
1969	1143.6013862911839
1970	1200.6914239534526
1971	1184.7177845838064
1972	1166.583796099847
1973	1232.181629765141
1974	1167.0700704635506
1975	1330.797235939434
1976	1280.6477096475714
1977	1395.004632963827
1978	1426.488827640459
1979	1313.7844541489587
1980	1438.3812952546511
1981	1477.3971142176124
1982	1436.5862042170277
1983	1631.7865372222668
1984	1613.6956413723026
1985	1645.9769759867395
1986	1657.6154805445337
1987	1646.9058743820135
1988	1806.0106193627855
1989	1945.4989756842529
1990	1926.1390872772938
1991	1958.6865490245532
1992	2049.2292925705533
1993	2096.897894895198
1994	2098.7692790463598
1995	2128.6425839461526
1996	2189.0815189313503
1997	2228.9442943476834
1998	2276.869139899792
1999	2355.9681103870776
2000	2375.967147790739
2001	2459.3126503447957
2002	2304.8066628158704
2003	2468.8896882858758
2004	2435.4745993297456
2005	2529.888554516611
2006	2550.8052834596865
2007	2705.197439742197
2008	2748.599382193924
2009	2736.354906863805
2010	2805.5455832903904
2011	2979.1116151177703
2012	3060.7188348630934
2013	3099.266792176557
2014	3091.0223686340455
2015	3010.7745337461474
2016	3122.086592997339
2017	3254.5079238839107
2018	3389.827994528884
2019	3498.9492526995327
2020	3494.7330638213157
2021	3602.1299011132573
2022	3650.0051112599403