Year	kilograms per hectare of arable land
1961	1.5793283947593977
1962	1.5870640707533528
1963	2.24059534996514
1964	2.9122996416415514
1965	2.83147724758463
1966	3.6379967178525376
1967	4.956614343233938
1968	5.881651188598797
1969	7.2591722661592435
1970	7.20379378151012
1971	9.060627157055887
1972	10.036888816693002
1973	9.716346083947602
1974	10.42504604482623
1975	12.150731890766027
1976	13.523219589944215
1977	14.49532535257934
1978	16.99692263445499
1979	18.600667939609615
1980	21.660267735560506
1981	22.929250991706244
1982	23.782471134486585
1983	24.792148017105724
1984	25.104239098128936
1985	28.64968908531214
1986	33.29433783721544
1987	31.54461452779931
1988	33.70705444703723
1989	35.47950759064857
1990	36.37989583755712
1991	35.95339826070241
1992	45.13662846073697
1993	44.72851337896819
1994	41.00737995680663
1995	41.66472644525472
1996	41.41383965351754
1997	48.452080785200074
1998	46.71029826301203
1999	48.75424069404784
2000	49.76583937983196
2001	49.135489682129105
2002	49.38349008751274
2003	51.250183449780046
2004	51.76770606187708
2005	57.673777355341244
2006	60.8317508690227
2007	55.91625492232992
2008	55.84726531538737
2009	64.70154312298244
2010	66.53968238685356
2011	62.0224287753179
2012	59.22505722462214
2013	67.54026185987149
2014	67.32400974890732
2015	67.36732109327076
2016	72.66241911880232
2017	80.85811929046598
2018	77.38966515185787
2019	79.48566862457795
2020	80.75369222116916
2021	82.06043358563271