Table 1 The total number of stations sampled and processed per year.

year	total	Grid	random	% random	% boating	processed
2008	3,892	3,562	330	8	84	3,792
2009	4,067	3,673	394	10	92	3,989
2010	4,051	3,650	401	10	92	3,966
2011	3,947	3,562	385	10	94	3,846
2012	3,920	3,535	385	10	95	3,849
2013	3,981	3,578	403	10	90	3,839
2014	4,216	3,507	709	17	94	4,176
2015	4,219	3,525	694	16	93	4,137
2016	4,278	3,563	715	17	94	4,168
2017	4,231	3,534	697	16	93	2,831
2018	4,233	3,531	702	17	93	2,274
2019	4,270	3,555	715	17	94	4,203
*2020	2,399	1,704	695	29	94	2,366
2021	4,471	3,733	738	17	94	4,415
**averages	4,109	3,565	544	13	92

The type of sampling station is shown (grid or random) with the percentage of random stations (% random), and the percentage of samples taken by boat instead of by foot (% boating). The numbers of samples processed in the laboratory are also given (processed). Note that sometimes a sample could not be processed in the laboratory and did not lead to an entry in the database (2-3% of the samples taken). Due to lack of funding, not all the samples from 2017 and 2018 have been processed yet.
* Due to COVID-restrictions less samples could be taken.
** Averages are presented without 2020 in which COVID-restrictions were in place.

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