Year	kg per hectare
1961	624.2
1962	785.7
1963	751.9
1964	774.9
1965	785.5
1966	840.7
1967	888.9
1968	877.8
1969	845.1
1970	828.6
1971	1000.3
1972	823.8
1973	840.6
1974	885.1
1975	820.5
1976	749.3
1977	753.7
1978	753.3
1979	762.6
1980	927.4
1981	897.8
1982	949
1983	784.7
1984	970.8
1985	986.7
1986	851.5
1987	847.6
1988	885.1
1989	882.7
1990	1112.5
1991	1052.8
1992	1050.8
1993	1235.4
1994	1131
1995	1141.7
1996	1389
1997	1286.7
1998	1498.6
1999	1645.7
2000	1682.3
2001	1719.9
2002	1750.9
2003	1827
2004	1853.9
2005	1836.3
2006	1827.9
2007	1569.4
2008	1735
2009	1711.5
2010	2270.5
2011	1882.8
2012	2079.8
2013	2176.6
2014	2206.9
2015	2200.3
2016	2219.8
2017	2247.4
2018	2254.4
2019	2263.2
2020	2180.7
2021	2237.2
2022	2291.5