Year	kg per hectare
1961	743
1962	782.8
1963	763.7
1964	717.8
1965	687.1
1966	607.8
1967	693.5
1968	671.1
1969	611
1970	722.9
1971	709.6
1972	654.9
1973	659.2
1974	996.1
1975	967.1
1976	725.2
1977	932.6
1978	916.1
1979	1053.3
1980	1087
1981	1655.5
1982	1632.9
1983	1526
1984	1266.3
1985	1247.9
1986	1156.7
1987	1203
1988	1305.5
1989	1252.9
1990	1147.9
1991	1094.1
1992	1164
1993	1153.1
1994	1132.3
1995	1210.5
1996	1220.4
1997	1182.8
1998	1201.8
1999	1239.3
2000	1171.5
2001	1233.6
2002	1255.2
2003	1308.8
2004	1372.8
2005	1421.7
2006	1507.5
2007	1399.8
2008	1598.4
2009	1531.1
2010	1528
2011	1334.4
2012	1399
2013	1234.7
2014	1552.4
2015	1552.7
2016	1733.4
2017	1614.7
2018	1684.2
2019	1628.2
2020	1620.5
2021	1619.2
2022	1656.2