Year	kg per hectare
1961	1917.6220707743275
1962	2062.7683318066133
1963	2079.5687660156204
1964	2161.4267287308926
1965	2281.0997794147165
1966	2300.8737992877927
1967	2563.8507486624244
1968	2594.081202026019
1969	2619.113211027089
1970	2505.6444763896366
1971	2938.1641553565714
1972	3010.5252104715055
1973	3078.5382876986214
1974	3187.2530581573255
1975	3051.274071406703
1976	3028.979371425075
1977	3170.4070355023646
1978	3459.5974015468146
1979	3300.8845479087327
1980	3542.78270267382
1981	3383.1596324301695
1982	3693.377364729953
1983	3526.190709680518
1984	4187.011886879604
1985	3979.7591165460553
1986	3904.974167128234
1987	3943.5768890033355
1988	4139.480262788988
1989	4183.562409533352
1990	4187.193354098447
1991	4408.242171473436
1992	3751.188995097226
1993	3980.887024428681
1994	3995.1933035540965
1995	4112.5471294008175
1996	4379.944833254876
1997	4476.6925355074945
1998	4531.439859158709
1999	4521.7106115811
2000	4397.748545977639
2001	4556.3652804861595
2002	4605.361716476027
2003	4144.74489610358
2004	5238.2895088796095
2005	4711.529796718368
2006	4562.01292024807
2007	4491.058111371341
2008	5105.972953000448
2009	4969.022729383238
2010	4916.014727529474
2011	5061.007648404112
2012	4821.251304868363
2013	5253.38897627744
2014	5612.193014551919
2015	5377.756274907766
2016	5193.830592104411
2017	5499.551101945192
2018	5230.171922938209
2019	5574.786763385186
2020	5465.240411423273
2021	5663.963137191217
2022	5260.315093567103