Year	kilograms per hectare of arable land
1961	6.551724137931035
1962	5.517241379310345
1963	8.956252152945229
1964	11.351909184726523
1965	12.02335967021642
1966	11.631307929969104
1967	14.785420944558522
1968	18.30592668722165
1969	16.08481532147743
1970	20.290003411804843
1971	22.8120531154239
1972	29.175619834710744
1973	31.413793103448278
1974	44.254989676531316
1975	48.326109391124874
1976	55.28743131868132
1977	59.247975708502025
1978	66.5989847715736
1979	75.3079009833842
1980	81.54379438620224
1981	51.94650499286733
1982	56.49235147634294
1983	56.93726937269373
1984	98.8187523071244
1985	139.8354473774426
1986	164.79740680713127
1987	196.22215046819503
1988	215.19696480464967
1989	181.11423550087872
1990	153.24858757062148
1991	139.45147679324896
1992	123.79853902345252
1993	108.50327048864948
1994	94.87080601619745
1995	114.92479753181642
1996	117.62437331276514
1997	112.22522175086772
1998	85.4994215194755
1999	79.44465869649055
2000	108.67052023121387
2001	115.47344110854503
2002	115.85835257890685
2003	116.73076923076923
2004	120.75471698113208
2005	132.20338983050848
2006	115.2542372881356
2007	140.582925911997
2008	183.7962962962963
2009	171.7153846153846
2010	181.9
2011	187.0858
2012	197.45910000000003
2013	200.02936153846153
2014	188.87826153846154
2015	190.43943076923077
2016	178.1153846153846
2017	150.5
2018	124.84615384615384
2019	47.13966923076923
2020	53.975876923076925
2021	50.88651153846154