Statistics for Empires by Size

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Size(Million km^2)	% of world	Year	Answer	% Correct
35.5	26.35%	1920	British Empire	89%
24.0	17.81%	1270 or 1309	Mongol Empire	86%
13.7	10.17%	1810	Spanish Empire	75%
5.2	3.86%	1683	Ottoman Empire	64%
5.0	3.71%	117	Roman Empire	64%
22.8	16.92%	1895	Russian Empire	64%
7.4	5.49%	1942	Empire of Japan	50%
5.5	4.08%	500 BC	Achaemenid Empire	46%
11.5	8.53%	1920	Second French Colonial Empire	43%
14.7	10.91%	1790	Qing Dynasty	39%
5.5	4.08%	1820	Second Portuguese Empire	36%
11.1	8.24%	750	Abbasid Calliphate	29%
11.1	8.24%	720	Umayyad Caliphate	29%
6.5	4.82%	100	Eastern Han Dynasty	25%
8.337	6.19%	1889	Empire of Brazil	25%
5.0	3.71%	1368	Northern Yuan Dynasty	25%
6.0	4.45%	50 BC	Western Han Dynasty	25%
11.0	8.16%	1310	Yuan Dynasty	25%
6.5	4.82%	1450	Ming Dynasty	21%
6.0	4.45%	557	First Turkic Khaganate	18%
5.2	3.86%	323 BC	Macedonian Empire	18%
6.4	4.75%	655	Rashidun Caliphate	18%
5.4	4.01%	715	Tang Dynasty	18%
4.6	3.41%	800	Tibetan Empire	18%
4.7	3.49%	10	Xin Dynasty	18%
9.0	6.68%	176 BC	Xiongnu Empire	18%
4.429	3.29%	1821	First Mexican Empire	14%
6.0	4.45%	1310	Golden Horde Khanate	14%
7.1	5.27%	1640	Iberian Union	14%
4.5	3.34%	200	Xianbei State	14%