Year	kilograms per hectare of arable land
1961	44.92527391357873
1962	46.15770741286205
1963	46.058006788028386
1964	48.19140649538288
1965	49.00156582738319
1966	56.88954800438455
1967	59.18678526048284
1968	68.02829467244456
1969	69.1456286531526
1970	77.50159337157424
1971	85.37854213844176
1972	87.1011173870334
1973	94.76086956521739
1974	93.79061439879382
1975	88.6062195815688
1976	108.28958293415086
1977	90.2890595009597
1978	103.55179028132993
1979	108.1626011041212
1980	106.83140506491837
1981	88.46939430920419
1982	95.39762287182782
1983	93.41239096972807
1984	104.71132834962623
1985	111.42020046260602
1986	119.1578541599743
1987	129.66600359342917
1988	134.416062142903
1989	132.29525528623
1990	128.8491033583306
1991	123.32822126097784
1992	103.59831590026972
1993	121.3249232412228
1994	130.17695528839658
1995	133.05090779636882
1996	151.7024221453287
1997	147.56037801890093
1998	172.9757380882783
1999	172.32139939092326
2000	160.40298507462686
2001	168.08022045315371
2002	164.45177782942133
2003	175.27095336867174
2004	165.4026103646833
2005	142.13954929141175
2006	142.32948113207547
2007	157.72223105037344
2008	106.54460281870595
2009	96.92694246619189
2010	130.67528735632183
2011	122.61646150132754
2012	122.58082736674622
2013	143.59650275018473
2014	151.35608405277733
2015	151.5015205787158
2016	143.96612515988258
2017	155.49520404623328
2018	157.69852539056328
2019	157.47590569590824
2020	159.815389422929
2021	161.0516311552291