Year Q1 Q2 Q3 Q4
---------------------------------
1970 - QE QC QL QI
1971 - UE UC UL UI
1972 - AE AC AL AI
1973 - LE LC LL LI
1974 - IE IC IL II Note that EI could also denote Q1 1984 or Q3 1988 etc
1975 - TE TC TL TI
1976 - YE YC YL YI
1977 - PE PC PL PI
1978 - EE EC EL EI
1979 - NE NC NL NI Date coding begins in the US
1980 - QE QC QL QI
1981 - UE UC UL UI
1982 - AE AC AL AI
1983 - LE LC LL LI
1984 - IE IC IL II Note that EI could also denote Q1 1974 or Q3 1988 etc
1985 - TE TC TL TI
1986 - YE YC YL YI
(change)
1987 - IIIP IIP IP P
1988 - IIIE IIE IE E Note that EI could also denote Q1 1974 or Q1 1984 etc
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
(change)
2000 - Q.III Q.II Q.I Q
2001 - U.III U.II U.I U
2002 - A.III A.II A.I A
2003 - L.III L.II L.I L
2004 - I.III I.II I.I I
2005 - T.III T.II T.I T
2006 - Y.III Y.II Y.I Y
2007 - P.III P.II P.I P
2008 - E.III E.II E.I E
2009 - N.III N.II N.I N
从其他网站看到的,一年中4个代码分别代表第一、第二、第三、第四季度,以2009年为例,N.III 代表2009年第一季度,N.II代表2009年第二季度,以此类推。