Year	kg per hectare
1961	1388.350256933081
1962	1386.0261372605385
1963	1531.0079642470807
1964	1450.7551740763622
1965	1592.7606844580139
1966	1734.0203885732776
1967	1758.380805004811
1968	1707.0570941021458
1969	1779.5866635875905
1970	1678.8659501255208
1971	2067.242980443698
1972	2137.6831856672234
1973	2034.3938271262061
1974	2056.5502619904105
1975	2159.72792811739
1976	2458.6232281147204
1977	2323.3714409751756
1978	2419.5961318772715
1979	2330.2055758993865
1980	2361.676541983057
1981	2348.7112528029925
1982	2617.8481253729105
1983	2444.692986942272
1984	2684.4341177471347
1985	2503.7436811298267
1986	2730.8215075852136
1987	2650.450394806281
1988	2734.961806728992
1989	2611.215755850198
1990	2790.3678707677827
1991	2816.895278529197
1992	1947.800612957089
1993	1942.425008466508
1994	1756.15211172644
1995	1728.5352190950737
1996	1706.9462263391888
1997	2057.9219800882706
1998	1834.290383004254
1999	1929.2149688116278
2000	1821.6369765348588
2001	2205.8076736951302
2002	2228.2877359559184
2003	2040.0871502057207
2004	2350.7886209887324
2005	2269.162383641692
2006	2243.7374028057607
2007	2165.404710971648
2008	2614.3682821007383
2009	2548.2985850464474
2010	2342.8513354362494
2011	2781.6784218735847
2012	2360.994246795619
2013	2820.8213126827727
2014	2975.3759941312005
2015	2894.6941481584463
2016	3104.5446765990473
2017	3238.462113133434
2018	3188.350136911602
2019	3242.7527154263826
2020	3196.1554031303135
2021	3311.8529001932284
2022	3414.1629466919785