The island has several Neolithic burial chamber sites , as well as the remains of Duke Hakon 's 13th @-@ century house dating from the Norse occupation of the island . The population reached 380 or more in the nineteenth century , when a fishing station was opened at Crabbaberry in West Voe . Subsequently it was a steady decline in population , although the numbers have increased from a low of 16 in the 1970s .