Year	kilograms per hectare of arable land
1961	4.001569242840329
1962	3.334639498432602
1963	3.5520186335403725
1964	4.056132256824299
1965	4.224270353302612
1966	4.5899172310007526
1967	5.538922155688622
1968	7.060998151571164
1969	6.001828822238479
1970	13.101339124140427
1971	18.429460580912863
1972	14.391109579600275
1973	14.92135989010989
1974	21.08843537414966
1975	18.22222222222222
1976	20.151567344126764
1977	23.429364803887538
1978	18.589272593681116
1979	25.028187337380746
1980	33.704974271012006
1981	35.678391959798994
1982	34.03600654664484
1983	27.4788
1984	22.009389671361504
1985	30.685681470137826
1986	28.86164229471316
1987	34.98898273962541
1988	31.248650593738756
1989	27.4299550328606
1990	20.581113801452783
1991	22.682758620689654
1992	30.40662108672184
1993	30.719424460431654
1994	20.70175438596491
1995	19.338959212376935
1996	18.07313642756681
1997	19.936708860759495
1998	12.90436005625879
1999	11.959212376933896
2000	11.037623066104079
2001	13.37252020573108
2002	26.074748257164988
2003	26.172929714683367
2004	29.90461215932914
2005	27.983865053171982
2006	25.677066047129106
2007	32.3343506273313
2008	38.65661861074705
2009	25.77774647887324
2010	29.173529411764704
2011	46.147222222222226
2012	37.62609736842104
2013	48.97213783783783
2014	51.83082702702703
2015	57.42153513513514
2016	65.7148972972973
2017	72.05291578947369
2018	52.51333421052631
2019	67.5756
2020	79.7640394736842
2021	63.9045605263158