Year	kilograms per hectare of arable land
1993	1.4056224899598393
1994	2.9748283752860414
1995	3.684931506849315
1996	13.531165311653117
1997	15.345268542199488
1998	13.052208835341366
1999	21.88755020080321
2000	19.464285714285715
2001	9.729537366548042
2002	6.236654804270462
2003	1.6281407035175879
2004	0.005016722408026756
2005	2.3161290322580643
2006	0.016417910447761194
2007	3.4895522388059703
2009	2.782608695652174
2010	0.41739130434782606
2011	0.8217391304347826
2012	0.9836086956521739
2013	1.1889420289855073
2014	1.4581159420289855
2015	1.470608695652174
2016	2.787304347826087
2017	2.5715362318840578
2018	6.799724637681158
2019	5.986637681159421
2020	5.058304347826087
2021	3.002