Year	kilograms per hectare of arable land
1961	3.577353538747294
1962	4.112695152013147
1963	4.777129174622054
1964	5.686905641898952
1965	5.96543019445322
1966	7.064154619755393
1967	9.203037065192069
1968	10.466299870866662
1969	12.29273183879603
1970	13.503278304113335
1971	15.805179760238172
1972	16.63761079021491
1973	17.38212939783644
1974	16.78230626483666
1975	20.04931083614548
1976	20.503293247270605
1977	24.68683374727177
1978	27.567769835018883
1979	28.551903952889305
1980	31.064337260370298
1981	33.395832228296534
1982	33.946977954792736
1983	38.09245485977672
1984	41.40300670287907
1985	44.966401364277964
1986	49.9030490474792
1987	45.32988692695722
1988	53.504172124697654
1989	55.924558848926516
1990	58.01141604464973
1991	60.04690598164809
1992	62.408489215310034
1993	58.57814330961664
1994	61.470183775523076
1995	62.91777337715019
1996	64.67282215569398
1997	71.42159566831778
1998	73.39304205641285
1999	78.89267318647644
2000	76.92818099811531
2001	78.0613309526023
2002	74.49155529422796
2003	77.14732163657865
2004	83.61655504910698
2005	89.15839498024798
2006	94.39084595207171
2007	95.79979335881971
2008	97.83228713166359
2009	105.91673261202658
2010	111.44659605734344
2011	111.42675761459103
2012	103.98567453742322
2013	105.99384918928384
2014	109.6678967829081
2015	111.83111946194114
2016	111.03580598740682
2017	118.34442728800369
2018	119.25298728900172
2019	125.38278330869979
2020	136.72954638597318
2021	130.3598021822145