Year	kg per hectare
1961	905.8
1962	951.4
1963	787.8
1964	747.8
1965	808.9
1966	780.2
1967	830
1968	1196.1
1969	1142.8
1970	1012.2
1971	1078
1972	1443.1
1973	941.7
1974	893
1975	679.4
1976	974.3
1977	962.3
1978	772.7
1979	767.6
1980	825.9
1981	902.2
1982	876.9
1983	734.9
1984	1015.9
1985	985.1
1986	821.2
1987	891.7
1988	1052.2
1989	920.9
1990	1061
1991	799.6
1992	755
1993	706.1
1994	792.5
1995	801.2
1996	899.7
1997	799.9
1998	864.8
1999	590
2000	363.2
2001	692.7
2002	1306.4
2003	1209.8
2004	1191.6
2005	948.1
2006	1329.2
2007	1264.8
2008	1403.5
2009	1774.5
2010	1697.1
2011	1798.5
2012	2318.9
2013	2214.8
2014	2048.1
2015	2693.5
2016	3075.3
2017	2747.8
2018	2675.8
2019	2586.4
2020	2582.3
2021	2729.6
2022	2902.1