Year	kilograms per hectare of arable land
2002	13
2003	27.25
2004	7.5
2005	6
2006	4.5
2007	0.5
2008	3.5
2009	13.25
2010	3
2011	3.25
2012	9.8475
2013	12.53
2014	7.952500000000001
2015	5.265000000000001
2016	18.2125
2017	5.2625
2018	3.4675000000000002
2019	10.272499999999997
2020	8.735000000000001
2021	8.3325