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Year Q1 Q2 Q3 Q4 --------------------------------- 1979 - -- -- NL NI 1981 - UE UC UL UI 1982 - AE AC AL AI 1983 - LE LC LL LI 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 1997 - IIIP IIP IP P 1998 - IIIE IIE IE E 1999 - IIIN IIN IN N 2000 - Q.