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For the premier stock exchange that pioneered the securities transaction

Over the decades, the stock market in the country has passed through 

good and bad periods. The journey in the 20th century has not been an 

easy one. Till the decade of eighties, there was no measure or scale that

 could precisely measure the various ups and downs in the Indian 

stock market. BSE, in 1986, came out with a Stock Index-SENSEX- 

that subsequently became the barometer of the Indian stock market.

The launch of SENSEX in 1986 was later followed up in January 1989 

by introduction of BSE National Index (Base: 1983-84 = 100). 

It comprised 100 stocks listed at five major stock exchanges in India - Mumbai,

 Calcutta, Delhi, Ahmedabad and Madras. 

The BSE National Index was renamed BSE-100 Index from October 14, 1996 and

 since then, it is being calculated taking into consideration only

 the prices of stocks listed at BSE. BSE launched the dollar-linked version of

 BSE-100 index on May 22, 2006.

With a view to provide a better representation of the increasing 

number of listed companies, larger market capitalization and 

the new industry sectors, BSE launched on 27th May, 1994 two 

new index series viz., the 'BSE-200' and the 'DOLLEX-200'.

 Since then, BSE has come a long way in attuning itself to the 

varied needs of investors and market participants. In order to

BSE disseminates information on the Price-Earnings Ratio, 

the Price to Book Value Ratio and the Dividend Yield Percentage 

on day-to-day basis of all its major indices.

The values of all BSE indices are updated every 15 seconds 

during market hours and displayed through the BOLT system,

 BSE website and news wire agencies.

All BSE Indices are reviewed periodically by the BSE Index Committee.

 This Committee which comprises eminent independent finance professionals

 frames the broad policy guidelines for the development and maintenance 

of all BSE indices. The BSE Index Cell carries out the day-to-day 

maintenance of all indices and conducts research on development of new indices.