| Country | Locality | Introduced | Year | Qualitative Value | Ref. |
|---|---|---|---|---|---|
| United Kingdom | English Channel | 1992 - 1992 | rare | 123252 | |
| United Kingdom | English Channel | 1993 - 1993 | common | 123252 | |
| United Kingdom | English Channel | 1994 - 1994 | rare | 123252 | |
| United Kingdom | English Channel | 1995 - 1995 | very common | 123252 | |
| United Kingdom | English Channel | 1996 - 1996 | very common | 123252 | |
| United Kingdom | English Channel | 1997 - 1997 | rare | 123252 | |
| United Kingdom | English Channel | 1998 - 1998 | common | 123252 | |
| United Kingdom | English Channel | 1999 - 1999 | common | 123252 | |
| United Kingdom | English Channel | 2000 - 2000 | very common | 123252 | |
| United Kingdom | English Channel | 2001 - 2001 | common | 123252 | |
| United Kingdom | English Channel | 2002 - 2002 | very common | 123252 | |
| United Kingdom | English Channel | 2003 - 2003 | extremely abundant | 123252 | |
| United Kingdom | English Channel | 2004 - 2004 | extremely abundant | 123252 | |
| United Kingdom | English Channel | 2005 - 2005 | very common | 123252 | |
| United Kingdom | English Channel | 2006 - 2006 | very common | 123252 | |
| United Kingdom | English Channel | 2007 - 2007 | abundant | 123252 | |
| United Kingdom | English Channel | 2008 - 2008 | common | 123252 |