 The population growth rate more than doubled in economically depressed Central Java in the latest 2010–2015 period vs 2000–2010, indicative of migration or other issues; there were significant volcanic eruptions during the earlier period.Approximately 45% of the population of Indonesia is ethnically Javanese, while Sundanese make a large portion of Java's population as well.The western third of the island (West Java, Banten, and DKI Jakarta) has an even higher population density, of nearly 1,500 per square kilometer and accounts for the lion's share of the population growth of Java.