ASE indices are used to portray the pattern of stock price movement and to measure the performance of the ASE in terms of return. Back in 1980, the Amman Financial Market (AFM) constructed an Unweighted Price Index supplemented by sub-indices for the four sectors: Banking and Finance Companies, Insurance, Services and Industrial. At that time 38 stocks were covered and a base value of 100 was stipulated on the opening session of January 1st 1980 for the Unweighted Price Index. The base was changed to 1000 as of January 1st 2004. More info at http://www.ase.com.jo/en/main-indices.