Year	kg per hectare
1961	1012.07026773425
1962	1031.6358612881734
1963	1064.366528831441
1964	1068.335954356714
1965	986.783991181954
1966	960.2372062535876
1967	1070.500718439441
1968	1118.0849436852502
1969	1118.1090374642974
1970	1182.7795584350877
1971	1185.6424021483463
1972	1174.0692404795159
1973	1194.7281408256142
1974	1189.089912604008
1975	1319.642195555435
1976	1286.7734058948938
1977	1356.154773529572
1978	1395.9291586060433
1979	1328.9477391909272
1980	1431.154680086859
1981	1483.3384281874355
1982	1504.868360343646
1983	1607.8595589106858
1984	1598.2901753138804
1985	1649.1477653444338
1986	1661.9518051178413
1987	1619.6800313935194
1988	1771.1642984017644
1989	1856.0569425226372
1990	1860.7259853386854
1991	1885.0539555938467
1992	1982.9411562840746
1993	2065.608299204777
1994	2062.1928558295863
1995	2071.3744115508384
1996	2115.8756129549292
1997	2152.028382565982
1998	2166.4118317354896
1999	2253.3087788143002
2000	2266.7253424546216
2001	2397.7144610151568
2002	2331.447992683034
2003	2403.559134994184
2004	2447.133889898137
2005	2476.921002469268
2006	2523.6724994802
2007	2577.9125651950367
2008	2707.9204348624876
2009	2700.1561297086296
2010	2716.52014871726
2011	2856.149031482138
2012	2869.009031951892
2013	2953.2947472204823
2014	3001.1504844226083
2015	2956.795491299854
2016	3028.855453049102
2017	3046.702162640248
2018	3191.096781036215
2019	3258.8455322440263
2020	3191.464782813944
2021	3366.5190478969917
2022	3297.3851716735394