Year	kg per hectare
1961	2001.2386105358858
1962	2216.8133663998497
1963	2057.63805016999
1964	2081.7067374436506
1965	2158.947552165547
1966	2144.719853396819
1967	2184.359663287792
1968	1892.7534997006794
1969	2034.8432429987154
1970	2291.7738641418314
1971	2191.116097334105
1972	2265.3273858807024
1973	2346.856021840969
1974	2599.229782453379
1975	2425.5092219466833
1976	2267.3225180182394
1977	2839.1412740210294
1978	2940.5399233758517
1979	3013.2887212423966
1980	3202.2228198515295
1981	3306.7843298316807
1982	3356.050493332847
1983	3256.675458480498
1984	3283.900557652885
1985	3338.0589413829093
1986	3361.581765172594
1987	3230.437162632522
1988	3165.872203791055
1989	3240.414529769465
1990	3158.010159143229
1991	3343.38421255992
1992	3430.637816940192
1993	3250.9235922039293
1994	3439.167063853575
1995	3552.64418146043
1996	3692.7562129771118
1997	3727.4677071014185
1998	3717.3459667324178
1999	3627.83401752624
2000	3620.513585863192
2001	3751.106819728145
2002	3747.254479995972
2003	3844.0342026448393
2004	3771.3180262803953
2005	3595.502170255991
2006	4121.637457786224
2007	3979.4455550071293
2008	3879.0725530034438
2009	3999.055776156157
2010	3986.3214610835994
2011	4072.668346691393
2012	4239.479163819721
2013	4593.713894567092
2014	4788.674756783535
2015	4922.457881833105
2016	4795.5952723094115
2017	5157.350755470586
2018	5270.065012112676
2019	5156.996023190506
2020	5042.030893376624
2021	5028.080519178093
2022	5387.659401665264