I plugged the list of the sockets used around the world into Excel to see which plugs were the most and least common. As I can't tell the number of sockets installed, I used the number of countries instead.

Excel returned the following:

Socket outlets without earth
Two round pins, 124 countries
American 15A, 58 countries

Socket outlets with earth
British 13A, 55 countries
German "Schuko", 53 countries
American 15A, 47 countries
French, pin earth 41 countries
Old British 5A, 40 countries
Australian 10A, 23 countries
Italian 10A, 9 countries
Danish, 9 countries
Old British 15A, 8 countries
Swiss 10A, 7 countries

I know the data is very, very shaky, but I thought I could share it with you.

[This message has been edited by C-H (edited 05-07-2003).]