question: What two areas have provided a constant stream of immigration to Bermuda since the 20th century ?
answer: West Indies , as well as continued immigration from Portuguese Atlantic islands
turker_answer: Since the 20th century , the West Indies and continued immigration from the Portuguese Atlantic islands have provided a constant stream of immigrants to Bermuda .
rule-based: West Indies , as well as continued immigration from Portuguese Atlantic islands have provided a constant stream of immigration to Bermuda since the 20th century .