2006 Bayliss T. Ducati
2005 Corser T. Suzuki
2004 Toseland J. Ducati
2003 Hodgson N. Ducati
2002 Edwards C. Honda
2001 Bayliss T. Ducati
2000 Edwards C. Honda
1999 Fogarty C. Ducati
1998 Fogarty C. Ducati
1997 Kocinski J. Honda
1996 Corser T. Ducati
1995 Fogarty C. Ducati
1994 Fogarty C. Ducati
1993 Russell S. Kawasaki
1992 Polen D. Ducati
1991 Polen D. Ducati
1990 Roche R. Ducati
1989 Merkel F. Honda
1988 Merkel F. Honda
as you can see, Ducati isn't competitive so they clearly need a displacement increase.