Year	kilograms per hectare of arable land
1975	56.32966383917591
1976	54.72018616873817
1980	116.95360011068556
1981	117.75359576090558
1982	122.984727527244
1983	133.54553780646071
2002	253.32722380006084
2003	256.43748331704705
2004	275.4014725631689
2005	285.55070582654196
2006	286.64401901871224
2007	300.73233309334034
2008	287.1584979674699
2009	295.95151063611235
2010	326.50785699342333
2011	340.33156901873514
2012	351.36077469834174
2013	355.91249498719674
2014	369.5725602268934
2015	366.0438047444934
2016	360.5618975262837
2017	363.39803741473446
2018	349.40971803450003
2019	309.915053296971
2020	308.19913982979017
2021	308.0808155107504