Year	kilograms per hectare of arable land
1992	316.775
1993	272.635
1994	432.984693877551
1995	376.0204081632653
1996	331.413612565445
1997	427.6242774566474
1998	445.2906976744186
1999	459.6140350877193
2000	436.71676300578036
2001	418.88439306358384
2002	403.4761904761905
2003	400.28901734104045
2004	358.6988636363636
2005	329.5511363636364
2006	322.0056179775281
2007	324.5257142857143
2008	279.84297475601113
2009	233.83446404341927
2010	266.56915325857307
2011	256.5066449688093
2012	250.38105606967883
2013	254.12521626297578
2014	263.0786785481417
2015	267.4663482414242
2016	258.4065993704548
2017	256.9541304347826
2018	261.7559687534382
2019	255.44335926722948
2020	255.81947743467933
2021	246.3553467808787