Year	kg per hectare
1961	341.8
1962	339.6
1963	382.8
1964	275.9
1965	329.8
1966	439.9
1967	316.9
1968	261.6
1969	309.6
1970	63.2
1971	448
1972	948.5
1973	275.6
1974	691
1975	446.2
1976	643.2
1977	415.1
1978	268.7
1979	132.3
1980	237.2
1981	275.2
1982	287.9
1983	265.3
1984	150.7
1985	200.7
1986	198.5
1987	190.7
1988	375.6
1989	288.9
1990	265.5
1991	381.3
1992	288.7
1993	424.3
1994	223.8
1995	458.4
1996	323.4
1997	276.8
1998	246.7
1999	228.5
2000	152.6
2001	554.4
2002	357.3
2003	1214.5
2004	274.3
2005	438.6
2006	372.4
2007	639.2
2008	360.8
2009	363.6
2010	371.6
2011	452.3
2012	367.2
2013	217.6
2014	305.2
2015	938.4
2016	471.6
2017	316.6
2018	549.5
2019	675.1
2020	1033.8
2021	1002.4
2022	684.1