Year	kilograms per hectare of arable land
1961	384.6156901688183
1962	462.5159362549801
1963	479.24075924075925
1964	431.86573146292585
1965	467.2469879518072
1966	503.2404426559356
1967	533.470707070707
1968	485.525783619818
1969	540.4129554655871
1970	524.1398176291793
1971	521.5906788247214
1972	539.5927051671732
1973	561.6517766497462
1974	531.0193285859614
1975	459.2515274949084
1976	470.1926605504587
1977	464.1136131013306
1978	484.692070030896
1979	462.30665280665283
1980	587.1430446194225
1981	547.3947368421053
1982	559.3667546174142
1983	594.2028985507246
1984	547.50656167979
1985	556.4136125654451
1986	556.2091503267974
1987	544.2558746736293
1988	541.0691003911343
1989	523.4680573663625
1990	501.30548302872063
1991	465.7894736842105
1992	396.63461538461536
1993	381.6884661117717
1994	339.36170212765956
1995	353.54691075514876
1996	364.26914153132253
1997	352.8735632183908
1998	353.9518900343643
1999	348.2245131729668
2002	326.2223557692308
2003	339.42155688622756
2004	337.2809523809524
2005	332.39739027283514
2006	325.86935866983373
2007	335.08820023837905
2008	224.48815165876778
2009	282.01428571428573
2010	324.94604316546764
2011	317.8060606060606
2012	328.55168119551684
2013	321.36151960784315
2014	304.03059975520193
2015	305.4779987944545
2016	275.0539910525076
2017	269.7357416267943
2018	266.76125882352943
2019	265.8835441147995
2020	259.04450415238426
2021	265.70662169031004