Year	kg per hectare
1961	1083.9
1962	1217.3
1963	1285.2
1964	1323.7
1965	983.5
1966	1441.6
1967	830.8
1968	1338.7
1969	1114.9
1970	1217.6
1971	1269.6
1972	933.1
1973	1318.5
1974	1393.6
1975	1414
1976	1345.5
1977	987.5
1978	1680.2
1979	1510.2
1980	1052.3
1981	1401.5
1982	875.6
1983	1646.2
1984	1609.3
1985	1453.1
1986	1521.9
1987	1436
1988	1629.4
1989	1676.4
1990	1716.1
1991	1691
1992	1666.2
1993	1833.1
1994	2015.1
1995	1270
1996	1873.5
1997	2175.2
1998	1928.7
1999	1992.3
2000	2107.3
2001	1959.6
2002	2197.5
2003	1020.7
2004	2116.4
2005	1694.6
2006	2111.7
2007	981.3
2008	1332.7
2009	1651.4
2010	1661.5
2011	2097.5
2012	2231.6
2013	1936.1
2014	2137.9
2015	2027.3
2016	2075.2
2017	2674.2
2018	2035.6
2019	1768.9
2020	1650.5
2021	2547.7
2022	2880.4