Statistics for Country and capital combinations that have every vowel in them?

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Answer	% Correct
USA/Washington	80%
Democratic Republic of the Congo/Kinshasa	40%
Dominican Republic/Santo Domingo	40%
Equatorial Guinea/Malabo	40%
Haiti/Port-Au-Prince	40%
Republic of the Congo/Brazzaville	40%
South Africa/Pretoria	40%
Argentina/Buenos Aires	20%
Bolivia/Sucre	20%
Ecuador/Quito	20%
Honduras/Tegucigalpa	20%
Mozambique/Maputo	20%
Papua New Guinea/Port Moresby	20%
Romania/Bucharest	20%
Sri Lanka/Sri Jayawardenepura Kotte	20%
Dominica/Roseau	0%
Guinea/Conakry	0%
Ivory coast/Yamoussoukro	0%
Lebanon/Beirut	0%
Slovenia/Ljubljana	0%
Suriname/Paramaribo	0%
Uruguay/Montevideo	0%