Year	kg per hectare
1961	1274.1707473735432
1962	1380.1757843017622
1963	1510.863280297623
1964	1598.0420204347251
1965	1683.2964411000066
1966	1765.812144385653
1967	1820.2821583517048
1968	1842.7534578666996
1969	1847.128339833407
1970	2042.2010011220182
1971	2078.461321733114
1972	2016.9154225242826
1973	2152.406949022793
1974	2239.122404315203
1975	2303.1979232955155
1976	2355.2722839105036
1977	2296.374402110692
1978	2537.308694149106
1979	2728.057722432028
1980	2695.304125246921
1981	2822.6799851768255
1982	3127.1817319697034
1983	3304.1813070570875
1984	3489.6274475688147
1985	3394.675096825936
1986	3451.9122962041597
1987	3513.0453973183216
1988	3479.6043659974716
1989	3570.981784955116
1990	3784.829060476626
1991	3757.367693036517
1992	3850.240791534567
1993	3984.2618732318074
1994	3975.250004172405
1995	4083.2392121439457
1996	4264.996311117256
1997	4216.06140860474
1998	4305.015729132451
1999	4301.37970326795
2000	4214.752134824103
2001	4260.955849776809
2002	4341.306157977372
2003	4341.826635262205
2004	4563.965378349165
2005	4619.748642437723
2006	4699.266830938837
2007	4734.234774011578
2008	4911.622627014338
2009	4866.157492793486
2010	4930.039650508853
2011	5071.0127937639445
2012	5185.911831266772
2013	5238.192959023235
2014	5270.238650605794
2015	5375.151813114183
2016	5366.534349756418
2017	5425.361776810543
2018	5455.107444613382
2019	5544.651175042566
2020	5554.557663607416
2021	5594.329809894416
2022	5623.300805674877