Year	kg per hectare
1961	346.2
1962	814
1963	803.8
1964	530.2
1965	606.3
1966	403.9
1967	631.4
1968	705.2
1969	614.9
1970	637.5
1971	587.8
1972	671.7
1973	493.7
1974	497.9
1975	845.2
1976	690.5
1977	410.9
1978	586.1
1979	561.5
1980	760.4
1981	646.2
1982	593.3
1983	579.5
1984	547.4
1985	912.5
1986	837.2
1987	759.9
1988	574.1
1989	760.4
1990	687.7
1991	1114.6
1992	943.3
1993	741.7
1994	749.4
1995	829.5
1996	1337.8
1997	779.8
1998	846.3
1999	1069.9
2000	883.3
2001	1106.9
2002	1058.6
2003	1470.3
2004	1344.1
2005	1500.8
2006	1503.7
2007	1253.5
2008	1034
2009	1653.9
2010	1474.3
2011	1643.3
2012	1677.6
2013	1813.1
2014	1369.2
2015	1400.2
2016	1020.4
2017	990.3
2018	1952
2019	1767.4
2020	1520.4
2021	1433.7
2022	1610.4