Year	kg per hectare
1961	849.9
1962	883.6
1963	857.4
1964	850.2
1965	882.1
1966	883.6
1967	879.8
1968	875.1
1969	884.2
1970	884.7
1971	821.9
1972	917.9
1973	924.8
1974	908
1975	1052.9
1976	1220.4
1977	1143.4
1978	1200.6
1979	1234.9
1980	1066.9
1981	1020.9
1982	1196.8
1983	1092.8
1984	1201.3
1985	1223.3
1986	1357
1987	1302.7
1988	1287.1
1989	1140.3
1990	1445.3
1991	1611.5
1992	1706.6
1993	1773.4
1994	1817.4
1995	1909.1
1996	1849.2
1997	1857.3
1998	2160.8
1999	2049.7
2000	1835.1
2001	1932.6
2002	2272.9
2003	2383.4
2004	2417.1
2005	2301.2
2006	2391.8
2007	2454.3
2008	1720.9
2009	1997.2
2010	2173.5
2011	1713.7
2012	1745.4
2013	1847.1
2014	2051.5
2015	2231
2016	2653.3
2017	2058.3
2018	2053.8
2019	1981.7
2020	1653
2021	1635.2
2022	1827