Year	kg per hectare
1992	3230.1
1993	3765.1
1994	5024
1995	4998.3
1996	4857.9
1997	5632.3
1998	5793.1
1999	5186.4
2000	4803.1
2001	4734.5
2002	6117.9
2003	4011.5
2004	5826.2
2005	6006.9
2006	5116
2007	5341.3
2008	5474.7
2009	5268.3
2010	5981
2011	6373.8
2012	5761.9
2013	4615.5
2014	6472.5
2015	6283.9
2016	6464.6
2017	5540
2018	6071.9
2019	6503.1
2020	7385.5
2021	6864.8
2022	5564.5