Year	kg per hectare
1961	1153.716579961442
1962	1217.0833263492677
1963	1288.9399231175498
1964	1329.8145544419465
1965	1335.1986915717862
1966	1389.075417122155
1967	1467.4819411793865
1968	1461.4019833608081
1969	1477.9399482872013
1970	1591.5853243703043
1971	1654.546567597653
1972	1627.0783531420334
1973	1680.036664743678
1974	1728.0445881574215
1975	1810.791892952756
1976	1837.8441629221122
1977	1847.9314179868845
1978	1976.8748285258093
1979	1993.1451944240396
1980	2030.6010362621769
1981	2117.284992853151
1982	2240.0376394784184
1983	2333.6503524108443
1984	2457.508981270446
1985	2420.8607803005507
1986	2459.8172636803306
1987	2484.3683288585457
1988	2550.9915899145044
1989	2633.2063229551677
1990	2737.2856061705193
1991	2762.589986249043
1992	2576.7477164510915
1993	2644.8480500202127
1994	2617.0022457671007
1995	2671.7334313596884
1996	2774.3481168087683
1997	2876.3493231756775
1998	2908.3075421000617
1999	2956.211529969844
2000	2856.7298477082363
2001	3007.6122965932036
2002	2991.339417224785
2003	3022.7211350244747
2004	3154.306991637492
2005	3164.7387062502444
2006	3229.536393898644
2007	3274.8673569064117
2008	3499.5633857608723
2009	3426.4260566352546
2010	3507.90549491993
2011	3683.7403444984966
2012	3689.2809413811274
2013	3841.9458955766677
2014	3891.9581411488
2015	3934.1542156985593
2016	3991.000674039462
2017	4137.053144360451
2018	4137.043945716754
2019	4237.7712256138575
2020	4192.450677086353
2021	4263.785903967408
2022	4350.288317379489