Year	kg per hectare
1961	2812.7
1962	2644.7
1963	2550
1964	3237.6
1965	3156.2
1966	2543.8
1967	3258.5
1968	3394.9
1969	2678.2
1970	3240.7
1971	3535.8
1972	3368
1973	3084
1974	4191.4
1975	3378.1
1976	3427.3
1977	3375.7
1978	3699.6
1979	3436.1
1980	3520.8
1981	3827
1982	3923.9
1983	3653.5
1984	4492.1
1985	3779.1
1986	3907.7
1987	3820.8
1988	3681.5
1989	4325.1
1990	4963.7
1991	4492.6
1992	3359.4
1993	4758.9
1994	3891.4
1995	4358.6
1996	4893.6
1997	4718.3
1998	4379.7
1999	4276.3
2000	4560.3
2001	4583.3
2002	4780.4
2003	4584.5
2004	4892.9
2005	4932.3
2006	4292.2
2007	5150.8
2008	4820.5
2009	5078.9
2010	4510.4
2011	4712.9
2012	5101.8
2013	5123.5
2014	5646.9
2015	6053.6
2016	5438.2
2017	5992.3
2018	3535.5
2019	6292.1
2020	5994.4
2021	5064.7
2022	6107.4