Year	kilograms per hectare of arable land
1961	172.66355140186917
1962	176.44613583138172
1963	185.12089201877933
1964	192.11764705882354
1965	200
1966	196.80851063829786
1967	211.86239620403322
1968	215.69560047562425
1969	238.54545454545453
1970	244.95073891625617
1971	259.7014925373134
1972	248.67591424968475
1973	263.3248730964467
1974	293.8053097345133
1975	290.63291139240505
1976	280.9583858764187
1977	300.50125313283206
1978	319.1542288557214
1979	322.82608695652175
1980	318.159509202454
1981	305.45454545454544
1982	303.81861575179
1983	302.9550827423168
1984	291.0798122065728
1985	274.0046838407494
1986	271.67630057803467
1987	265.2023121387283
1988	250
1989	241.7995444191344
1990	243.7093023255814
1991	234.34723788049607
1992	234.3097949886105
1993	232.54237288135593
1994	231.02678571428572
1995	212.7659574468085
1996	210.0502512562814
1997	228.53957636566332
1998	223.83073496659242
1999	224.48979591836735
2000	219.56769055745164
2001	200.0851305334847
2002	205.57972665148063
2003	213.50746268656715
2004	215.2301495972382
2005	218.86542923433873
2006	216.41841491841492
2007	220.41754632887637
2008	213.55697550585728
2009	179.1251437332311
2010	170.00363372093022
2011	192.15892420537898
2012	187.32109865747015
2013	190.8167548846502
2014	194.53339602563784
2015	204.29268244334014
2016	204.41125692752155
2017	199.5845238243771
2018	203.81967355984114
2019	210.2712960815559
2020	208.41096983581045
2021	208.53980099502488