Year	kg per hectare
1961	816.4
1962	809.6
1963	788.2
1964	777.6
1965	809.2
1966	1088.7
1967	916.1
1968	859.3
1969	824.8
1970	858.2
1971	860.7
1972	867.1
1973	863.7
1974	957.1
1975	834.3
1976	816.7
1977	832
1978	837.2
1979	844.2
1980	717.8
1981	860
1982	764
1983	517.4
1984	840.1
1985	890.7
1986	984.8
1987	938.6
1988	1095.8
1989	1012.9
1990	989.2
1991	1220.8
1992	1042.1
1993	1340.2
1994	1327.5
1995	1354.1
1996	1389.2
1997	1321.7
1998	1333.8
1999	1297
2000	1309.2
2001	1186.1
2002	1349
2003	1396.4
2004	1373.3
2005	1432.3
2006	1334.5
2007	1317
2008	1598.1
2009	1659.8
2010	1814.3
2011	1594.2
2012	1768.1
2013	1688.8
2014	1703.4
2015	1830.3
2016	1842.4
2017	1930.7
2018	2172.6
2019	2346.2
2020	2410.8
2021	2360.5
2022	2503.9