Year	kg per hectare
1961	888.3
1962	875
1963	897.3
1964	912.5
1965	923.9
1966	916.1
1967	905.8
1968	852.9
1969	783
1970	892.2
1971	760.9
1972	781.3
1973	952.8
1974	986.8
1975	889.9
1976	829.5
1977	798.1
1978	823.5
1979	800
1980	850
1981	766.9
1982	740.3
1983	714.3
1984	1000
1985	1000
1986	1000
1987	1250
1988	1000
1989	1375
1990	1000
1991	1000
1992	1000
1993	1000
1994	999.9
1995	1000
1996	1000
1997	1217
1998	1226.8
1999	1350.5
2000	1476.6
2001	1622.4
2002	1671.4
2003	1502.4
2004	1970.1
2005	1764.7
2006	1928.6
2007	1958.8
2008	2078.8
2009	2141.7
2010	2247.1
2011	2372.2
2012	2494.2
2013	2527.8
2014	2309
2015	2280.1
2016	2467.8
2017	2391.6
2018	2469
2019	2423.6
2020	2423.9
2021	2438.5
2022	2435.9