Year	kg per hectare
1961	1784.8
1962	1761.6
1963	1758.2
1964	1806.4
1965	1744.9
1966	1585.5
1967	1652.7
1968	1686.2
1969	1770.3
1970	1857.8
1971	1792.4
1972	1797.6
1973	1741.8
1974	1809.5
1975	1759
1976	1847.4
1977	1695.8
1978	1621.2
1979	1687.5
1980	1681.8
1981	1621.7
1982	1593.7
1983	1729.7
1984	1742.6
1985	1749.3
1986	1782.2
1987	1884.6
1988	1823.3
1989	1955.7
1990	1945.3
1991	1927.5
1992	1934.2
1993	1924.4
1994	1926.3
1995	1968
1996	2007.9
1997	2000.8
1998	1875.4
1999	1962.3
2000	1890.9
2001	2020.7
2002	1967.4
2003	2201.7
2004	2353.2
2005	2514.5
2006	2565.3
2007	2620.1
2008	2811.3
2009	3183.4
2010	3271.6
2011	3238
2012	3289.2
2013	3203.2
2014	3010.1
2015	3057.8
2016	2852.1
2017	2750.2
2018	2645.1
2019	2389
2020	2468.9
2021	2675.1
2022	2793.4