Year	kg per hectare
1961	1101.58649046739
1962	1159.7462803782466
1963	1221.4651305015748
1964	1256.739009339775
1965	1242.9184541644045
1966	1280.9445076740108
1967	1359.2772390430603
1968	1359.8437545393283
1969	1370.0329474695031
1970	1469.825971123904
1971	1507.8708431051837
1972	1483.7551555792409
1973	1529.9859253736836
1974	1584.4216639471447
1975	1671.0645526913656
1976	1675.4802180247034
1977	1695.7712945836806
1978	1804.8152978745804
1979	1832.7939554063626
1980	1874.793901741373
1981	1967.832460125186
1982	2044.4734150594954
1983	2131.606490298296
1984	2205.093925756809
1985	2175.164692072727
1986	2200.0832058823157
1987	2215.782860057338
1988	2268.255197409681
1989	2322.011363685669
1990	2405.34788471376
1991	2419.2067603050114
1992	2340.6554479642004
1993	2401.675343696404
1994	2335.1716184088127
1995	2377.1269145106535
1996	2479.6881124030597
1997	2530.918124889246
1998	2571.695601091717
1999	2626.731467445775
2000	2581.0506488016445
2001	2681.954926308575
2002	2670.2262754428407
2003	2679.014062267215
2004	2787.733886495127
2005	2780.5347049027487
2006	2873.490980513285
2007	2923.37762554968
2008	3072.1205887177794
2009	3054.7573769592755
2010	3080.160286516261
2011	3217.4006625168818
2012	3259.140443357128
2013	3338.3180248116355
2014	3373.356022239705
2015	3459.499662414252
2016	3449.522129640944
2017	3576.6497042136452
2018	3575.049917550392
2019	3678.1649706737785
2020	3654.155624716124
2021	3692.0493617189913
2022	3766.1938296449953