Year	kg per hectare
1961	1115.1
1962	1079
1963	985.8
1964	1082.8
1965	1098.9
1966	1012.3
1967	1224.5
1968	1287.5
1969	1310.4
1970	1105.1
1971	976.2
1972	1006.9
1973	1279.6
1974	1301.9
1975	1316.4
1976	1362.4
1977	1224
1978	1291.9
1979	1323.7
1980	1349
1981	1338.3
1982	1330.2
1983	1355.6
1984	1334.1
1985	1331.7
1986	1314
1987	1359.8
1988	1285.7
1989	1237.6
1990	1200.6
1991	1160.4
1992	1097.8
1993	1132.9
1994	1140.4
1995	1214.5
1996	1204.4
1997	1348.8
1998	1388
1999	1285.7
2000	806.3
2001	1006.7
2002	1669.8
2003	1458
2004	1334.8
2005	1790.4
2006	1551.7
2007	1915.3
2008	1455.4
2009	2040.7
2010	2011.1
2011	1659.9
2012	2094.2
2013	2127.7
2014	2096.6
2015	2206.4
2016	2043.3
2017	2091.4
2018	2253.2
2019	2184.7
2020	2050.8
2021	2099
2022	2253.3