Year	kg per hectare
1992	1641.2
1993	1774.4
1994	1842.7
1995	1687
1996	2153.3
1997	2144.2
1998	2057.7
1999	1885
2000	2199
2001	2091.5
2002	2478.3
2003	2176
2004	2426.2
2005	2802.9
2006	2264
2007	2941.6
2008	3104.4
2009	3075.3
2010	2775.5
2011	2738
2012	3767.5
2013	3373.8
2014	3486.5
2015	4513.1
2016	3828.4
2017	4250.2
2018	3026.3
2019	4310.1
2020	4662.8
2021	3900.2
2022	4186