Year	kg per hectare
1961	592.2
1962	544.1
1963	758.6
1964	635.4
1965	546.6
1966	658.7
1967	668.8
1968	669.3
1969	727.3
1970	705.7
1971	634.9
1972	482.6
1973	512.7
1974	645.6
1975	578.8
1976	510.8
1977	523.3
1978	515.4
1979	491.7
1980	546.6
1981	721.9
1982	675.8
1983	522.6
1984	503.8
1985	624.2
1986	584
1987	554.3
1988	734.4
1989	549.2
1990	559.2
1991	618.6
1992	729.9
1993	501
1994	746.5
1995	581.8
1996	601.3
1997	582
1998	685.2
1999	672.8
2000	531.3
2001	634.7
2002	670.9
2003	827.3
2004	671.2
2005	749.9
2006	766.8
2007	799.3
2008	775.2
2009	598.3
2010	762.8
2011	632
2012	934.8
2013	822.8
2014	855.7
2015	801.9
2016	844.7
2017	825.2
2018	893
2019	886.3
2020	867.1
2021	814.3
2022	845.5