Year	kg per hectare
1961	1813.6761246768758
1962	1974.7436350600926
1963	2014.3221050699017
1964	2056.8819138936624
1965	2157.2406119347274
1966	2186.4170391470134
1967	2412.417601779458
1968	2404.6747473592586
1969	2440.9333509349885
1970	2337.104753989371
1971	2751.6462456009262
1972	2794.7177020351965
1973	2817.8149312761284
1974	2920.0799150560797
1975	2831.7588355074427
1976	2840.282373068757
1977	2989.7436979623094
1978	3228.276119332342
1979	3109.566562448739
1980	3321.6929929273724
1981	3193.756989727136
1982	3482.867965988627
1983	3326.361510406022
1984	3925.6350942516356
1985	3693.4481042079033
1986	3695.5474635632827
1987	3692.349172625823
1988	3853.004011824574
1989	3827.612016767623
1990	3918.20424743689
1991	4092.9969080585306
1992	2574.5870978373014
1993	2620.675073921518
1994	2510.074520340918
1995	2535.6328375569883
1996	2706.139074866228
1997	2932.083087950867
1998	2922.937444986236
1999	2943.920887569621
2000	2890.647255908559
2001	3086.0954103724794
2002	3142.191932543955
2003	2898.7971476120256
2004	3392.401473740397
2005	3171.4438376556
2006	3124.131640018903
2007	3058.1024397439473
2008	3547.022587877041
2009	3431.939681055735
2010	3289.2785011961946
2011	3583.8675324284004
2012	3276.1227016798584
2013	3662.281651348368
2014	3899.6199291734642
2015	3803.3771237041224
2016	3818.7609872768116
2017	3966.4142722174092
2018	3839.0136337310905
2019	4028.2402037583115
2020	3932.6802168015183
2021	4031.1759069008917
2022	4043.058239863934