Year	kilograms per hectare of arable land
1961	12.705494505494505
1962	18.43879781420765
1963	22.15570652173913
1964	22.682972972972973
1965	23.463978494623657
1966	29.838502673796793
1967	26.178457446808512
1968	26.3005291005291
1969	27.966578947368422
1970	33.18477703741671
1971	32.44053643724696
1972	31.628935532233882
1973	41.75524134568503
1974	38.24301541425819
1975	21.810934489402698
1976	28.05883754168652
1977	24.842979242979244
1978	31.785821643286575
1979	36.05348418616611
1980	34.60271115745568
1981	30.638628448968657
1982	30.118715083798882
1983	39.02919501133787
1984	51.81496402877698
1985	59.422764227642276
1986	77.98628503279666
1987	90.18205461638492
1988	95.55410264792415
1989	101.14657980456026
1990	109.45110635260528
1991	113.96648044692738
1992	140.98360655737704
1993	167.10069444444446
1994	167.39894551845342
1995	191.03773584905662
1996	213.09823677581863
1997	219.4752774974773
1998	237.49368367862556
1999	263.9977777777778
2000	275.42857142857144
2001	271.3142857142857
2002	288.5012121212121
2003	323.72866666666664
2004	379.1406666666667
2005	326.408275862069
2006	377.3933333333333
2007	478.85340729001587
2008	486.55956233565274
2009	425.5747701155761
2010	446.7465684822766
2011	385.2037360284611
2012	381.7265746734491
2013	403.44618535873184
2014	412.85309748244697
2015	460.8864322961617
2016	381.9746731320065
2017	349.88190893502644
2018	348.4496376697668
2019	330.5051747857931
2020	346.6993539587476
2021	359.05258391049546