Year	kg per hectare
1961	1512.6
1962	1780.7
1963	1289.5
1964	1000
1965	1644.4
1966	2524.9
1967	1723.9
1968	2409.8
1969	2858.7
1970	2775.6
1971	3592.8
1972	3155.9
1973	3200.5
1974	2757.3
1975	2212
1976	2784
1977	2773.4
1978	2501.9
1979	2545.3
1980	2454.5
1981	2609.1
1982	2541.3
1983	3038.5
1984	4441.7
1985	4740.6
1986	4407.5
1987	3543.6
1988	3845.5
1989	3738.4
1990	4190.8
1991	3723.8
1992	4434.6
1993	4243
1994	3728.8
1995	3853.3
1996	4866.7
1997	5043.5
1998	5180
1999	4902.4
2000	8900
2001	7203.7
2002	7763.2
2003	6555.6
2004	6473.7
2005	7539.7
2006	7793.1
2007	9453.7
2008	7541
2009	8000
2010	6833.3
2011	3901.8
2012	3389.6
2013	3219.1
2014	3765.1
2015	2695.9
2016	3455
2017	5234.8
2018	5272.7
2019	6880
2020	8942.5
2021	8640.6
2022	9247.2