Year	kilograms per hectare of arable land
1982	6
1983	9.0625
1984	6.25
1985	6.25
2002	0
2003	0
2004	0
2005	0
2006	0
2007	0
2008	10.126875
2009	11.028823529411765
2010	10.464705882352941
2011	7.174117647058823
2012	8.186666666666666
2013	8.42388888888889
2014	6.364210526315789
2015	8.2725
2016	10.3375
2017	11.847
2018	8.386
2019	15.5305
2020	11.854
2021	11.348500000000001