Year	kilograms per hectare of arable land
1961	90
1962	96
1963	108
1964	120
1965	180
1966	240
1967	320
1968	440
1969	580
1970	680
1971	680
1972	1100
1973	1160
1974	1094.3396226415093
1975	820
1976	640
1977	600
1978	232.8
1979	317.8723404255319
1980	191.11111111111111
1981	250.2325581395349
1982	403.25
1983	383.2432432432432
1984	496
1985	569.0909090909091
1986	515.1515151515151
1987	566.6666666666666
1988	866.6666666666666
1989	2396
1990	1972.7586206896551
1991	2321.4285714285716
1992	1067.5814814814814
1993	691.2407407407409
1994	253.82
1995	99.865
1996	118.82631578947368
1997	44.92631578947368
1998	621.325
1999	1109.56
2000	1061.435
2001	20.285
2002	249.815
2003	679.8
2004	246.825
2005	283.16818181818184
2006	226.49130434782606
2007	43.277153558052426
2008	6.741573033707865
2009	98.87640449438203
2010	134.0823970037453
2011	94.38202247191012
2012	294.2059925093633
2013	126.0861423220974
2014	270.11235955056173
2015	263.12359550561797
2016	192.01498127340827
2017	147.49812734082397
2018	176.50187265917603
2019	239.77902621722848
2020	197.8052434456929
2021	199.76404494382024