Year	kg per hectare
1993	256.6
1994	767
1995	416
1996	264.9
1997	265.5
1998	959.7
1999	746.6
2000	377.2
2001	637.1
2002	158.2
2003	261
2004	275.3
2005	758.2
2006	798.5
2007	938.5
2008	252.2
2009	500.1
2010	511.7
2011	649.1
2012	689.4
2013	669.8
2014	666.4
2015	642.4
2016	639.7
2017	642.2
2018	638.9
2019	640.3
2020	640.5
2021	639.9
2022	640.2