Year	kg per hectare
1992	993.7
1993	963.8
1994	880.8
1995	915.9
1996	1038.8
1997	1314.2
1998	1235.3
1999	1235.5
2000	1310.7
2001	1397.9
2002	1889.3
2003	2100.6
2004	2150.4
2005	2164.4
2006	2158.7
2007	2440
2008	2141
2009	3119.4
2010	3117.2
2011	2519.3
2012	2891.1
2013	3159.4
2014	3189.4
2015	3261
2016	3348.7
2017	3459.5
2018	3404.4
2019	3636.7
2020	3482.6
2021	3711.4
2022	3265.8