Year	kg per hectare
1961	400
1962	861.6
1963	817.8
1964	898.3
1965	772.8
1966	662.5
1967	816.2
1968	525.7
1969	317.9
1970	681.2
1971	899
1972	497.2
1973	1085.3
1974	752.8
1975	1113.8
1976	841.8
1977	855.3
1978	626.9
1979	566.2
1980	517
1981	635.1
1982	1042.6
1983	1387.5
1984	966.3
1985	1395.6
1986	1380.6
1987	1106.6
1988	1269.1
1989	1248.3
1990	1098.2
1991	970.3
1992	833.4
1993	858.4
1994	732
1995	735
1996	660.5
1997	756.7
1998	634.1
1999	606.2
2000	770.1
2001	708.4
2002	585.4
2003	785.3
2004	787.5
2005	474.3
2006	1098
2007	942.5
2008	1382.8
2009	1551.8
2010	1370.3
2011	1487.2
2012	1565.3
2013	1319.8
2014	1668
2015	574.7
2016	1279.6
2017	843.7
2018	1379.6
2019	1271.9
2020	1218.6
2021	1420
2022	1113.3