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Total number of samples available for each sampling year by the respective country
| Country | Year of sampling | |||||||
|---|---|---|---|---|---|---|---|---|
| 2006 | 2008 | 2009 | 2012 | 2013 | 2014 | 2015 | 2016 | |
| United Kingdom | 0 | 0 | 0 | 0 | 15 | 643 | 434 | 0 |
| Greece | 3 | 6 | 3 | 12 | 0 | 31 | 0 | 0 |
| Netherlands | 0 | 0 | 0 | 0 | 0 | 0 | 257 | 273 |
| Total | 3 | 6 | 3 | 12 | 15 | 674 | 691 | 273 |
