SIEV X happened in 2001.
let event is X so P(X)=75%=0.75 probabilty that event will not happen P(X')=1-P(X) P(X')=1-0.75 P(X')=0.25 so probabilty that event will not happen is 0.25
Insector X happened in 1989.
X-Note happened in 2011.
X-Moto happened in 2005.
X-Wars happened in 2002.
X-Zone happened in 1992.
Star X happened in 2002.
Project-X happened in 1992.
Rally-X happened in 1980.
Ranger X happened in 1993.
X-Squad happened in 2000.
X-Multiply happened in 1998.