The SET Index is a Thai composite stock market index calculated by the prices of all common stocks (including unit trusts of property funds) on the main board of the Stock Exchange of Thailand (SET), except for stocks that have been suspended for more than one year. It is a market capitalization-weighted price index which compares the current market value of all listed common shares with its value on the base date of April 30, 1975, when the Index was established and set at 100 points. The formula of calculation is as follows: SET Index = ( Current Market Value x 100 ) / Base Market Value The SET Index calculation is adjusted in line with modifications in the values of stocks resulting from changes in the number of stocks due to various events, e.g., public offerings, exercised warrants, or conversions of preferred to common shares, in order to eliminate all effects other than price movements from the index. Besides the SET Index, which is calculated from the stock prices of all common stocks listed on The SET, The SET also provides other indices to investors that include the: Market for Alternative Investment (MAI) Index Industry Group and Sectoral Indices SET50 Index and SET100 Index Annual Returns The following table shows the annual development of the SET Index since 1975. Components Foods Charoen Pokphand Foods () Khon Kaen Sugar () Minor International () Thai President Foods () Thai Union () Automotive Thai Rung Union Car () Consumer electronics I-Mobile () Communications Advanced Info Service () DTAC () Intouch Holdings () Thaicom () True Corporation () Construction material Siam Cement () TPI Polene () Chemicals Indorama Ventures () IRPC () PTT Global Chemical () Oil & gas PTT Exploration and Production () PTT Public Company Limited () Thai Oil () Electric power Glow Energy () Steel products Sahaviriya Steel Industries () Aviation Bangkok Airways () Nok Air () Thai AirAsia () Thai Airways () Construction Christiani & Nielsen () International Engineering Public Company Limited () Resources Banpu () Thai Rubber Latex Corporation () Thai Tap Water Supply ()Banking Bangkok Bank () Bank of Ayudhya () Kasikornbank () Kiatnakin Bank () Krung Thai Bank () Siam Commercial Bank () Thanachart Bank () Tisco Bank () TMB Bank () Insurance Bangkok Insurance () Real estate Areeya Property () Bangkok Land () Land and Houses () Pace Development () Pruksa Real Estate () Raimon