The island is divided into four of Nova Scotia's eighteen counties: Cape Breton, Inverness, Richmond, and Victoria. Their total population at the 2016 census numbered 132,010 Cape Bretoners; this is approximately 15% of the provincial population. Cape Breton Island has experienced a decline in population of approximately 2.9% since the 2011 census. Approximately 75% of the island's population is in the Cape Breton Regional Municipality (CBRM) which includes all of Cape Breton County and is often referred to as Industrial Cape Breton, given the history of coal mining and steel manufacturing in this area, which was Nova Scotia's industrial heartland throughout the 20th century.