Year	kg per hectare
1961	4173.5
1962	4339.6
1963	4224
1964	4318.4
1965	4398.2
1966	4509.3
1967	5136.6
1968	5227.3
1969	5072.2
1970	5125.4
1971	4917
1972	5507.2
1973	5748.1
1974	5630
1975	5933.3
1976	5276.2
1977	5931.6
1978	5897
1979	5705.6
1980	4843.2
1981	5206.9
1982	5308.4
1983	5300.5
1984	5957.7
1985	5847.2
1986	5898.9
1987	5683.5
1988	5469.2
1989	5673.7
1990	5846.3
1991	5415.6
1992	5876.7
1993	4429.4
1994	6448.7
1995	6003.2
1996	6154.5
1997	6061.5
1998	5809.5
1999	5998.9
2000	6256.6
2001	6107
2002	6085.5
2003	5451
2004	5942.3
2005	6154
2006	5852.4
2007	6062.1
2008	6262.4
2009	5919.5
2010	5853.7
2011	6010.6
2012	6248.5
2013	6281.5
2014	6325.1
2015	6316.7
2016	6253.4
2017	6284.5
2018	6404.7
2019	6546.7
2020	6472.9
2021	6787.3
2022	6273