Record counts
| # | Migration site | Totals | Date | ||
|---|---|---|---|---|---|
| 1. | Parnassia, Kennemerduinen | 1 | 17 October 1986 | ||
| 2. | Parnassia, Kennemerduinen | 1 | 14 October 1990 | ||
| 3. | Parnassia, Kennemerduinen | 1 | 10 October 1995 | ||
| 4. | Parnassia, Kennemerduinen | 1 | 19 October 2012 | ||
| 5. | Parnassia, Kennemerduinen | 1 | 13 October 2014 | ||
| 6. | Parnassia, Kennemerduinen | 1 | 14 October 2018 | ||
| 7. | Parnassia, Kennemerduinen | 1 | 13 October 2019 | ||
| 8. | Parnassia, Kennemerduinen | 1 | 28 September 2020 | ||
