Year	kg per hectare
1961	714.3
1962	711.3
1963	916.7
1964	932.6
1965	1020.4
1966	1000
1967	1090.9
1968	1347.8
1969	952.4
1970	888.9
1971	952.4
1972	894.3
1973	679.4
1974	706.2
1975	647.7
1976	648.2
1977	658.7
1978	457.6
1979	689.7
1980	845.4
1981	978.1
1982	646.7
1983	746.2
1984	677.9
1985	767.8
1986	854.6
1987	770.3
1988	801.9
1989	834.9
1990	624.3
1991	635.2
1992	639.2
1993	646.5
1994	654.4
1995	735.6
1996	746.3
1997	746.3
1998	755.8
1999	736.4
2000	753.9
2001	775
2002	772
2003	780.7
2004	776.4
2005	770.6
2006	777.8
2007	764.1
2008	771.4
2009	791.4
2010	785
2011	794.3
2012	809.8
2013	830.9
2014	832.8
2015	833.5
2016	845.6
2017	860.4
2018	870.8
2019	889
2020	886.8
2021	887.4
2022	887.3