Year	kilograms per hectare of arable land
1961	320.375
1962	477.4375
1963	446.5625
1964	571.6875
1965	344.3125
1966	388.375
1967	444.4375
1968	363.25
1969	312.4375
1970	356.25
1971	268.75
1972	285
1973	326.875
1974	406.25
1975	262.5
1976	300
1977	224.4375
1978	368.75
1979	356.25
1980	362.5
1981	375
1982	375
1983	277.5625
1984	291.6875
1985	208.25
1986	237.5
1987	193.75
1988	193.75
1989	187.5
1990	168.75
1991	168.75
1992	168.75
1993	168.75
1994	168.75
1995	200
1996	200
1997	200
1998	187.5
1999	200
2000	200
2001	200
2002	45.857142857142854
2003	79.71428571428571
2004	214.23076923076923
2005	109.07692307692308
2006	139
2007	133.6153846153846
2008	135.15384615384616
2009	77
2010	135.08333333333334
2011	96.27272727272727
2012	199.522
2013	133.56842105263155
2014	80.0111111111111
2015	121.565
2016	113.80428571428571
2017	147.8542857142857
2018	77.98857142857143
2019	54.39714285714286
2020	50.59
2021	37.19857142857143