Year	kilograms per hectare of arable land
1961	310.98987108655615
1962	358.634817563389
1963	385.3828645748659
1964	394.09494535519127
1965	383.18173805746517
1966	566.610797115572
1967	622.7987123650823
1968	681.5864022662889
1969	741.3157384048127
1970	795.3776775648253
1971	784.3323996265173
1972	1036.6882479890132
1973	1046.3500622148485
1974	765.1434643995749
1975	943.2327868852459
1976	1028.5210970464136
1977	1215.922832140016
1978	1318.9434259806822
1979	1142.9949826321883
1980	1085.6368563685637
1981	1115.232536245528
1982	1209.9767981438515
1983	1362.4120603015076
1984	1314.7356143079317
1985	1247.584225128815
1986	1539.708091865207
1987	1509.3607305936073
1988	1616.005699358822
1989	1704.3918918918919
1990	1754.434870755195
1991	1697.7278529486853
1992	1700.1781623822856
1993	1772.7160188165387
1994	1878.5910567074693
1995	1886.0312657589511
1996	1689.3732970027247
1997	1553.6723163841807
1998	1596.770576362413
1999	1481.7987152034261
2000	1228.0475312435976
2001	1158.1245090337784
2002	1153.7070629100733
2003	1187.6588295088757
2004	1077.4465637879805
2005	1109.734187317113
2006	1066.1000256915304
2007	973.6233752282737
2008	857.197570266653
2009	1123.8029356449556
2010	1065.3723452739039
2011	995.7093696911618
2012	1138.7807960879386
2013	1110.3345709222851
2014	1238.3466615073735
2015	1292.7607947019867
2016	1286.9717136659435
2017	1402.9142733188721
2018	1572.9833481152993
2019	1494.375553047404
2020	1563.34990990991
2021	1637.0925688073394