1984 - IE IC IL II 1985 - TE TC TL TI 1986 - YE YC YL YI
1987 - PE PC PL PI 1988 - IIIE IIE IE E (change) 1989 - IIIN IIN IN N 1990 - IIIQ IIQ IQ Q 1991 - IIIU IIU IU U 1992 - IIIA IIA IA A 1993 - IIIL IIL IL L 1994 - IIII III II I 1995 - IIIT IIT IT T 1996 - IIIY IIY IY Y