Year	kg per hectare
1961	795.7156352504192
1962	1106.0925926299444
1963	1040.1003740162407
1964	976.833042201282
1965	1012.9564240099829
1966	881.7177236931574
1967	1008.4279453601025
1968	1194.540927829296
1969	1085.3429850401992
1970	1001.9176802569945
1971	1117.823027597755
1972	1207.2792695058074
1973	924.0222453308922
1974	1081.6021877966205
1975	1073.7558301057131
1976	1138.3374104832092
1977	904.7571697640577
1978	1067.385376057805
1979	989.3894205993593
1980	1156.7368788095612
1981	1072.6268240473987
1982	1106.8070323494057
1983	1010.1053565949612
1984	982.4755027185248
1985	1156.0616442661296
1986	1278.7067042821036
1987	1183.2757247437678
1988	1417.6251085441777
1989	1236.153819661654
1990	1419.125398401137
1991	1531.2015712239534
1992	1348.1052182929418
1993	1397.2664589308345
1994	1476.5436164087484
1995	1362.6825825890335
1996	1639.8253767282738
1997	1367.0324717099877
1998	1475.7976378845353
1999	1466.2552170800486
2000	1438.3420665682456
2001	1584.3496918594788
2002	1766.034620070966
2003	1789.3126693249342
2004	1935.3307558457782
2005	1524.6623997334063
2006	1916.0667502183812
2007	1680.9949584375088
2008	1702.60196291414
2009	1959.4836086929795
2010	1733.8534072893658
2011	1866.549240222555
2012	2033.244009438166
2013	1967.8945479812721
2014	1798.6435980157453
2015	2166.2371642852013
2016	1702.3941355741892
2017	1884.1208925353114
2018	1796.0685575529424
2019	1948.4151866951863
2020	1864.6705794953427
2021	1957.9223897267377
2022	1910.1654618298458