Year	kg per hectare
1966	2500
1967	2250
1968	2500
1969	2250
1970	2400
1971	2285.7
1972	2300
1973	2000
1974	2055.6
1975	1875
1976	1821.4
1977	1666.7
1978	1750
1979	1920
1980	1705.9
1981	1800
1982	1787.9
1983	1789.5
1984	1705.9
1985	1900
1986	1904.8
1987	1920
1988	2035.7
1989	2142.9
1990	2381
1991	1833.3
1992	1713.6
1993	1690.1
1994	1668.4
1995	1607.1
1996	1639
1997	1634.2
1998	1631.8
1999	1631.7
2000	1600
2001	1614.9
2002	1562.5
2003	1571.4
2004	1578.9
2005	1597.4
2006	1625
2007	1601.4
2008	1619
2009	1590.2
2010	1585.9
2011	1597.4
2012	1595.3
2013	1593.1
2014	1583
2015	1579.6
2016	1843.2
2017	2030.7
2018	2233.9
2019	2369.3
2020	3800
2021	2094.1
2022	3081