Year	kg per hectare
1961	939.7
1962	937.7
1963	1031.7
1964	1035.7
1965	1003.7
1966	1050.3
1967	1054.7
1968	1091.7
1969	1063.5
1970	1109.8
1971	1082.7
1972	891.3
1973	1152.9
1974	965.5
1975	1153.7
1976	1030.2
1977	1072
1978	1314.8
1979	1380.4
1980	1572.3
1981	1471.3
1982	1566.2
1983	1712.6
1984	1622.7
1985	1658
1986	1905.7
1987	1665.4
1988	1763.8
1989	1549.1
1990	1524.5
1991	1417.1
1992	1688.1
1993	1787.1
1994	1725.2
1995	1681.3
1996	1689.3
1997	1686.4
1998	1706.5
1999	1634
2000	1687.7
2001	1692.9
2002	1731.9
2003	1860.2
2004	1798.1
2005	1778.7
2006	1902.3
2007	1822.5
2008	1811
2009	2076.7
2010	2086.1
2011	1994.8
2012	1944.2
2013	1763.2
2014	1914.3
2015	1940.4
2016	1933.7
2017	2104.1
2018	2281.8
2019	2248.8
2020	2223.7
2021	2403.1
2022	2358.9