Year	kg per hectare
1961	877.4
1962	858.2
1963	911.1
1964	926.5
1965	935.7
1966	923.5
1967	960.7
1968	948.7
1969	887.2
1970	1000
1971	941.1
1972	979.3
1973	873.8
1974	777.7
1975	571.7
1976	795.8
1977	772.8
1978	710.4
1979	622.8
1980	595.7
1981	591.7
1982	498.4
1983	489
1984	510
1985	531.3
1986	544
1987	398.2
1988	393.3
1989	395.7
1990	476.7
1991	344.2
1992	177.6
1993	564.7
1994	520.3
1995	652.4
1996	821.8
1997	821.4
1998	839
1999	985.4
2000	868.1
2001	880.1
2002	588.7
2003	819.2
2004	774.2
2005	428.4
2006	692.4
2007	581.4
2008	533.5
2009	884.3
2010	1028.6
2011	1041
2012	1252.1
2013	652.6
2014	795.6
2015	814.5
2016	736.5
2017	777.6
2018	897.1
2019	908.3
2020	747
2021	1035.9
2022	1014.5