[n = 7]
| Year / Period | From | To | Established | Ecol. effects |
|---|---|---|---|---|
| 1990 - 1999 | Unknown | Poland | established | unknown |
| 1992 - 2000 | United States of America | Romania | probably not established | probably some |
| 1974 | Unknown | Russia | probably established | |
| 1986 | USA | Hungary | not established | unknown |
| 1988 | USA | China | unknown | |
| 1993 | USA | Austria | not established | probably none |
| 1995 | Unknown | Czech Republic | no data | no data |