226Comparison 
with regional average Country$ US$ PPPPPP-UN Guernsey (U.K.)(same) Isle of Man (U.K.)(lower) Jersey (U.K.)(same) 8. North America Bermuda (U.K.)(same) Greenland (Denmark)(same) St. Pierre/Miquelon (France)(lower) Abbreviations: n.a. = not available. Sources: Armstrong et al. (1998), few own supplements; $ US and $ PPP are based on World Bank data from 1993; PPP-UN are based on UN data from 1991. Parentheses indicate estimations, which however appear relatively reliable. Regional averages are based on UN data from 1991 and regional classifications of the World Bank are used (eight regions worldwide).