Year	kilograms per hectare of arable land
1961	0.8733128999300962
1962	0.6627215849843587
1963	1.0755102040816327
1964	1.475
1965	1.9793753970969161
1966	2.432802665679378
1967	3.064321203169061
1968	2.837029893924783
1969	3.3179296826125038
1970	3.611002779736962
1971	3.1821371084237895
1972	3.5393143091767603
1973	3.4003104448347696
1974	3.0519770796927705
1975	2.438038248493915
1976	3.146908564302667
1977	2.9739843906343806
1978	4.264067540121859
1979	5.154416135039822
1980	4.556558766707409
1981	3.7849660637922242
1982	4.165528010931095
1983	4.603550755603901
1984	6.1274983569799355
1985	6.255530335090216
1986	5.7867452812129105
1987	6.397409030291484
1988	6.1630067887890165
1989	5.783906309029089
1990	6.2276575729068675
1991	6.270614692653673
1992	9.266380436811648
1993	10.929713648196355
1994	17.112378694718128
1995	19.358052019922525
1996	31.42731148022931
1997	29.633967789165446
1998	28.2771194165907
1999	29.91064942612233
2000	31.2222503617945
2001	31.06721689612917
2002	30.233938697868066
2003	40.24077886027317
2004	43.856402385325715
2005	35.43913280223487
2006	40.56342303098433
2007	48.52169398862779
2008	34.84410558896406
2009	22.85236310077789
2010	39.158016056584856
2011	41.88427633878296
2012	34.640674963215716
2013	36.25234506096524
2014	35.1811728465895
2015	26.506505846684732
2016	40.144170059134765
2017	41.06520444016352
2018	47.02657018291464
2019	50.86975872976605
2020	55.15937786661195
2021	62.17919097016252