Year	kilograms per hectare of arable land
1961	2.379015031066806
1962	2.9968845537924005
1963	3.638048300130815
1964	4.760400638559778
1965	4.8116836617781855
1966	6.652514982316345
1967	9.176481162601473
1968	10.700249327006325
1969	12.05818625511775
1970	13.348194371945143
1971	15.715643519004495
1972	16.754853976792145
1973	16.822740804944228
1974	15.440502165399787
1975	20.59742919963167
1976	20.89318827979981
1977	25.992545825803273
1978	30.613118295589988
1979	32.04565134402846
1980	33.75805754894447
1981	36.29282819284638
1982	36.0474442920461
1983	40.38239407474395
1984	46.92040947761346
1985	51.143499629467144
1986	57.604534534815244
1987	51.66627122697029
1988	63.674606905282715
1989	67.28098489146241
1990	70.73691256595603
1991	74.53164770254014
1992	73.46702284997151
1993	74.36387431844686
1994	83.63752500123448
1995	87.61552373273402
1996	86.75119396086889
1997	95.60469833211378
1998	98.6313079634921
1999	106.95726800530106
2000	100.86512647203605
2001	104.6717026583587
2002	99.78209176685796
2003	102.4705640309105
2004	112.1073109870002
2005	124.2691994925316
2006	131.27794607253594
2007	134.641185657892
2008	143.7375385695268
2009	157.58393938072817
2010	166.34748006375705
2011	168.1063232722735
2012	152.73023345212403
2013	150.33743724291878
2014	157.34160631844432
2015	163.9833762202662
2016	160.45753589882042
2017	165.74196824565766
2018	170.6630858969308
2019	178.68037158432153
2020	198.23843491057997
2021	186.920308625151