Banking services are provided by the National Bank of Tuvalu. Public sector workers make up about 65% of those formally employed. Remittances from Tuvaluans living in Australia and New Zealand, and remittances from Tuvaluan sailors employed on overseas ships are important sources of income for Tuvaluans. Approximately 15% of adult males work as seamen on foreign-flagged merchant ships. Agriculture in Tuvalu is focused on coconut trees and growing pulaka in large pits of composted soil below the water table. Tuvaluans are otherwise involved in traditional subsistence agriculture and fishing.