As far as the annual index performance since 1986 is concerned, the Dow recorded the highest year-end value in 2017 (24,719.22). Since the dip during the 2008 financial crisis, the index performance has steadily improved every year, expect 2015 when a slight decrease could be observed. The monthly index has also been performing well, especially since the beginning of 2017. As of September 2018, the leading stocks of the DJIA index in terms of performance were Merck, Microsoft and Apple. The Dow stock whose price lost most in value in the third quarter of 2018 was IBM. The share price of this multinational conglomerate decreased by 24.6 percent. The best day of the Dow Jones Industrial Average since 1897 was October 6th, 1931, when the index value increased by 14.87 percent within one day.
In addition to the headline index, the Dow tracks other stock groups. The Dow Jones Composite Index is composed of 65 leading U.S. companies: 30 stocks forming the Dow Jones Industrial Average index, 20 stocks from the Dow Jones Transportation index and 15 stocks from the Dow Jones Utility Average index. Each of these gives analysts a better view of each segment of the market, helping them understand how the entire economy is progressing. Other indices, such as the Dow Jones Sustainability World Index, follow criteria such as environmental sustainability or social matters. Such an index helps investors support the causes about which they care.