Year	kg per hectare
1961	2872.6
1962	3776.9
1963	2936.1
1964	3627.4
1965	3212.2
1966	3305.7
1967	3983.4
1968	3852.2
1969	3651.4
1970	3692.5
1971	4282.9
1972	4079.6
1973	4198.3
1974	4766.9
1975	4256.9
1976	4530.2
1977	4004.4
1978	4815.8
1979	5078.4
1980	4623.7
1981	4948.1
1982	5279.9
1983	5071
1984	6162.9
1985	5720.6
1986	5090.7
1987	5043.2
1988	6328.9
1989	6780.9
1990	5983.9
1991	6103.6
1992	5877.4
1993	6209
1994	5807.6
1995	6068.8
1996	6706.8
1997	6407
1998	6641
1999	5643.1
2000	6402.2
2001	6011.9
2002	6269.8
2003	5086.5
2004	6732.5
2005	6300.4
2006	6165
2007	6418.5
2008	6413.1
2009	6578.3
2010	6093.9
2011	6874.6
2012	6464.3
2013	5945.6
2014	7044.6
2015	6431.9
2016	5154.6
2017	6800.2
2018	6332.3
2019	6580.8
2020	6978
2021	5515.8
2022	6083.6