[n = 6]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| unknown | Unknown | Canada | established | some |
| unknown | unknown | France | established | probably none |
| 1970 - 1980 | unknown | United Kingdom (Scotland) | established | probably some |
| 1982 | Unknown | UK | established | probably some |
| 1985 | Eastern Europe | Italy | established | unknown |
| 1986 | Europe | USA | established | some |