Year	kilograms per hectare of arable land
1969	0.5361930294906166
1970	2.150537634408602
1971	2.193548387096774
1972	3.9948453608247423
1973	6.97084917617237
1974	4.369538077403246
1975	4.2321644498186215
1976	7.368421052631579
1977	5.636363636363637
1978	6.065857885615252
1979	7.155172413793103
1980	6.937394247038917
1981	10.808580858085808
1982	10.871302957633892
1983	12.195121951219512
1984	12.668665667166417
1985	13.747228381374724
1986	15.007656967840735
1987	18.4407796101949
1988	14.505494505494505
1989	12.445414847161572
1990	10.656934306569344
1991	11.695906432748538
1992	11.086637298091043
1993	0.7396449704142012
1994	0.3785011355034065
1995	1.514004542013626
1996	1.514004542013626
1997	4.88997555012225
1998	3.1203566121842496
1999	2.3529411764705883
2000	2.8960817717206133
2001	2.7199320016999575
2002	3.7726887192536047
2003	3.4059691368492455
2004	4.998723295599626
2005	3.1165842849838077
2006	5.542414702629116
2007	5.121702127659574
2008	5.798663324979114
2009	6.22504124398198
2010	8.964183717223692
2011	10.810496980956804
2012	12.842678810673885
2013	19.723317117145122
2014	14.671920469261824
2015	17.464667836248502
2016	19.513091774662787
2017	27.77388089603919
2018	31.765466325146903
2019	35.233503913305235
2020	33.21392584849651
2021	31.257773109243697