Statistics for Countries containing 4 different vowels

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Country	% Correct
United States	91%
United Arab Emirates	80%
Dominican Republic	74%
Indonesia	73%
South Africa	73%
South Korea	73%
Uzbekistan	71%
Central African Republic	69%
Democratic Republic of the Congo	68%
Equatorial Guinea	67%
Mozambique	66%
Ethiopia	65%
Republic of the Congo	65%
Turkmenistan	65%
Guinea	64%
Federated States of Micronesia	62%
Papua New Guinea	62%
United Kingdom	62%
Guinea-Bissau	61%
Ukraine	61%
East Timor	59%
Burkina Faso	56%
Singapore	56%
Estonia	55%
Bosnia and Herzegovina	53%
Ecuador	53%
Macedonia	51%
São Tomé and Príncipe	49%
Sierra Leone	48%
Suriname	45%
Georgia	44%
Slovenia	44%