In 1998, PAGASA conducted "Name a Bagyo Contest", a contest designed to revise the naming scheme for typhoons within the Philippine Area of Responsibility with 140 names submitted in 1999 and the contest prompted PAGASA to begin using the revised naming system with four sets of 25 names and 10 auxiliary names, (replacing its list of female names that used since 1963) rotating every four years, in 2001 and later revised in 2005.[1][2][3][4]