wikipedia.com #01

Cambodia
1.Independence from France.....November 9, 1953
2.Total Area..................................181,035 km2
3.Population (2008 census)........13,388,910
4.nominal GDP (2008 est.).........$10,820 millions
..-Per capita..................................$760

Singapore
1.Separation from Malaysia.......August 9, 1965
2.Total Area..................................707.1 km2
3.Population (2008 est.).............4,839,400
4.nominal GDP (2008 est.)...... $192,800 millions
..-Per capita.................................$41,839

Thailand
1.Constitutional Monarchy.......June 24, 1932
2.Total Area................................513,115 km2
3.Population (2007 est.)...........63,038,247
4.nominal GDP (2008 est.)......$272,100 millions
..-Per capita...............................$4,155

Vietnam
1.Independence from France....September 2, 1945
2.Total Area..................................331,690 km2
3.Population (mid 2008 est.).....86,116,559
4.nominal GDP (2008 est.)........$90,880 millions
..-Per capita.................................$1,055

Summary in ratio - lowest figure based
Area - 256 : 1 : 726 : 469
Population - 3 : 1 : * : 18
GDP - 1 : 18 : 25 : 8
Per capita - 1 : 55 : 5.5 :1.4

*sorry data is incomparable now