Year	kg per hectare
1961	707.5
1962	729.4
1963	644.8
1964	748.6
1965	811.9
1966	787.3
1967	748.2
1968	766.8
1969	872.9
1970	829.6
1971	831.4
1972	687.9
1973	673.4
1974	796.2
1975	880.6
1976	679.1
1977	615.7
1978	1077.5
1979	847.8
1980	726.1
1981	837.9
1982	785
1983	840.4
1984	696.6
1985	1084
1986	1089.8
1987	1033.4
1988	962
1989	939.7
1990	726.4
1991	1055.3
1992	738
1993	762.8
1994	817.8
1995	810.1
1996	1100.6
1997	1063.9
1998	1204.2
1999	1174.1
2000	1006.5
2001	986.3
2002	788.6
2003	981.4
2004	1206.5
2005	1089.5
2006	1124.8
2007	1101.2
2008	1397.7
2009	1800.4
2010	1452.8
2011	1046.8
2012	1506.8
2013	1512.4
2014	1550.7
2015	1575.5
2016	1607.5
2017	1601.9
2018	1728.9
2019	1767.7
2020	1686
2021	1441.2
2022	1671