Year	kg per hectare
1961	2352.1
1962	2381.4
1963	2411
1964	2439.5
1965	2411.1
1966	2424.2
1967	2642.7
1968	2659.2
1969	2707.4
1970	2901.6
1971	3022.4
1972	3002.1
1973	2981
1974	2960
1975	2686.3
1976	2957.9
1977	2948.7
1978	2986.2
1979	3259.6
1980	3201.6
1981	3038.6
1982	3073.9
1983	3075.7
1984	2470.1
1985	2358.5
1986	2408.6
1987	2562.4
1988	2721.8
1989	2565.5
1990	3326.1
1991	3094.4
1992	3594.6
1993	3262.2
1994	3582.1
1995	3604
1996	3424.4
1997	2468
1998	2463.2
1999	1712.4
2000	2277.3
2001	1449.4
2002	1669.3
2003	1532.7
2004	1573.3
2005	1555.2
2006	1478.4
2007	1673.8
2008	1724.5
2009	1657.5
2010	1667.4
2011	1639.5
2012	1471.7
2013	1610.5
2014	1329.4
2015	1110.4
2016	1444.3
2017	1627.5
2018	1688.1
2019	1530.5
2020	1522.7
2021	1589.6
2022	1637.6