Year	kilograms per hectare of arable land
1980	125
1981	47
1982	136.25
1983	53.25
1984	211.25
1985	223.75
1986	315
1987	100
1988	175
1989	100
1990	1050
1991	1100
1992	1125
1993	750
2002	168
2003	51
2004	75.75
2005	154.25
2006	33
2007	282.75
2008	84.5
2009	103
2010	431.75
2011	117.5
2012	113.5
2013	55.75
2014	177.25
2015	177.25
2016	177.25
2017	177.25
2018	177.25
2019	177.25
2020	177.25
2021	177.25