 The combined island population reached its peak in 1921, at 173,503 inhabitants, and went into steady decline in the following decades, dropping to pre-1850s level by 1981.The depopulation trend was reversed only in the 1990s, with the 2001 census registering a population of 122,418, up from 110,953 in 1991.The main industries on the islands are agriculture, fishing and tourism.