Year	kilograms per hectare of arable land
1961	51.29483282674772
1962	59.92660550458716
1963	62.74153846153846
1964	35.328173374613
1965	59.19565217391305
1966	56.88125
1967	51.528301886792455
1968	94.93987341772151
1969	65.67834394904459
1970	87.69009584664536
1971	84.9807073954984
1972	97.3462783171521
1973	114.93485342019544
1974	57.62735849056604
1975	126.03951890034364
1976	144.03508771929825
1977	95.47321428571429
1978	143.22727272727272
1979	158.4537037037037
1980	138.70335820895522
1981	143.78623188405797
1982	167.8
1983	171.55172413793105
1984	155.1478260869565
1985	176.58560311284046
1986	193.58527131782947
1987	199.89361702127658
1988	210.357833655706
1989	219.24329501915707
1990	215.2651515151515
1991	208.51224105461392
1992	263.5594795539034
1993	241.14995400183992
1994	264.72837022132796
1995	258.07265388496467
1996	257.06060606060606
1997	207.32925586136597
1998	202.73726273726274
1999	199.63402571711177
2000	146.4939024390244
2001	150.07142857142858
2002	159.65
2003	158.23214285714286
2004	131.4070796460177
2005	108.97560975609755
2006	109.02608695652174
2007	109.8360655737705
2008	112.01456310679612
2009	181.4499424626007
2010	202.772397094431
2011	151.20238095238096
2012	196.52680652680652
2013	183.8705631506334
2014	158.20653529558493
2015	157.99959341329537
2016	204.03615196078428
2017	174.79179476306584
2018	156.84425955147515
2019	187.751191705007
2020	167.5558053782719
2021	155.39573713226406