Year	kg per hectare
1961	1122.8435395660233
1962	1183.5290535938027
1963	1251.7336502944395
1964	1286.3206243079908
1965	1274.3768441492846
1966	1315.4859489080825
1967	1396.9516062386244
1968	1396.651548552991
1969	1404.857603744511
1970	1520.3248551874867
1971	1559.5719650641458
1972	1531.9641531816944
1973	1582.6486170144167
1974	1637.8423886872076
1975	1730.7304961755842
1976	1732.7552412677167
1977	1761.1181839616247
1978	1874.9969030825384
1979	1903.9888979742109
1980	1944.8397390753585
1981	2048.223580617817
1982	2146.090484537928
1983	2238.472250148511
1984	2322.2366636321312
1985	2296.2620768316133
1986	2318.521128162892
1987	2333.1083126835733
1988	2399.8864121961005
1989	2470.1684489369654
1990	2558.467594645411
1991	2567.186823153202
1992	2464.066059976793
1993	2516.8828950575585
1994	2478.798898500544
1995	2523.2257708502216
1996	2632.569936067738
1997	2700.6100656106805
1998	2741.7729168819255
1999	2799.770859237036
2000	2748.85316748209
2001	2867.262371979774
2002	2850.3435973258715
2003	2877.461217054325
2004	2972.3662599919808
2005	3005.6830291252686
2006	3081.4906847690268
2007	3139.6946023926735
2008	3319.620078480148
2009	3279.909580275277
2010	3334.7878742177845
2011	3485.43084530621
2012	3502.684169823175
2013	3620.3203057973724
2014	3662.6395958853795
2015	3719.4432966324057
2016	3754.9151106742247
2017	3871.32973924569
2018	3886.5908768263043
2019	3983.2764817118004
2020	3951.8797674284588
2021	3995.0920249934507
2022	4082.7873027474284