▃ First year's design	2002 ~2003 2001 ~2002 2000～2001 1999～2000 1998～1999
▃ Second year's design	2002 ~2003 2001 ~2002 2000～2001
▃ Third year's design	2002 ~2003 2001 ~2002 2000 ~2001 1999～2000
▃ Fourth year's design