Index of Industrial Production Base Year, Number of Items, Number of 2-Digit Industry Groups, Month of Release and Period of Compilation

Base Year	Number of Items	Number of 2-digit Industry groups	Month of Release	Period of Compilation
Base Year	Number of Items	Number of 2-digit Industry groups	Month of Release	From	To
1	2	3	4	5	6
1946	35	19˜	*	1947	1955
1951	88	15	Oct 1955	1952	1961
1956	201	16	July 1962	1951	1966
1960	312	16	July 1967	1961	1973
1970	352	18 **	Mar 1975	1971-72	1984-85
1980-81	352	17	Feb 1987	1981-82	1997-98
1993-94	543	17 X	May 1998	1994-95	Till date

Notes: Individual Industries only; * Information not available; ** Industry groups 20 & 21 shown separately; X Industry groups 35 & 36 clubbed together

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