Statistics for Flags of historical countries that no longer exist

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Answer	% Correct
Soviet Union	100%
Yugoslavia [flag of Socialist Yugoslavia]	93%
East Germany (German Democratic Republic)	91%
Czechoslovakia	90%
Austria-Hungary	88%
Ottoman Empire	81%
Kingdom of Prussia	77%
Republic of Texas	77%
Tibet	72%
Hawaiian Kingdom (later Republic of Hawaii, 1894-98)	64%
South Vietnam (Republic of Vietnam)	62%
Confederate States of America	57%
Zaire	55%
Corsican Republic	50%
South Yemen (People's Democratic Republic of Yemen)	46%
Gran Colombia (Colombia, Venezuela, Ecuador, Panama)	44%
Manchukuo (Empire of Manchuria)	44%
Rhodesia	38%
North Yemen (Yemen Arab Republic)	33%
Orange Free State	30%
Principality of Moldavia	29%
Federal Republic of Central America (aka United Provinces of Central America)	28%
United Arab Republic (Egypt + Syria)	28%
Principality of Wallachia ("Romanian Country")	26%
Chechen Republic of Ichkeria	25%
Sultanate of Zanzibar	22%
Tuvan People's Republic	21%
South African Republic aka Transvaal	20%
Tanganyika	19%
Biafra	17%
Kingdom of Sikkim (protectorate of India before annexation)	15%
Ryukyu Kingdom	14%
Republic of Yucatán	12%
Mutawakkilite Kingdom of Yemen (North)	10%
Trucial States (of the Coast of Oman) [now UAE]	10%
State of Katanga	8%
Don Republic (Don Cossacks)	5%
Italian Regency of Carnaro (Fiume)	5%
Kuban People's Republic (Kuban Cossacks)	5%
Mountainous Republic of the Northern Caucasus	5%
Gagauz Republic (in Moldova)	4%
Hyderabad State	2%
South Kasai	2%