IQ by Country

Hong Kong (PRC)	107	Russia	96	Fiji	84
South Korea	106	Slovakia	96	Iran	84
Japan	105	Uruguay	96	Marshall Islands	84
Taiwan (ROC)	104	Portugal	95	Puerto Rico (US)	84
Singapore	103	Slovenia	95	Egypt	83
Austria	102	Israel	94	India	81
Germany	102	Romania	94	Ecuador	80
Italy	102	Bulgaria	93	Guatemala	79
Netherlands	102	Ireland	93	Barbados	78
Sweden	101	Greece	92	Nepal	78
Switzerland	101	Malaysia	92	Qatar	78
Belgium	100	Thailand	91	Zambia	77
China (PRC)	100	Croatia	90	Congo-Brazzaville	73
New Zealand	100	Peru	90	Uganda	73
United Kingdom	100	Turkey	90	Jamaica	72
Hungary	99	Indonesia	89	Kenya	72
Poland	99	Suriname	89	South Africa	72
Australia	98	Colombia	89	Sudan	72
Denmark	98	Brazil	87	Tanzania	72
France	98	Iraq	87	Ghana	71
Norway	98	Mexico	87	Nigeria	67
United States	98	Samoa	87	Guinea	66
Canada	97	Tonga	87	Zimbabwe	66
Czech Republic	97	Lebanon	86	Congo-Kinshasa	65
Finland	97	Philippines	86	Sierra Leone	64
Spain	97	Cuba	85	Ethiopia	63
Argentina	96	Morocco	85	Equatorial Guinea	59

Table courtesy of Wikipedia
Map courtesy of R. Pongett

The tabular data above comes from Lynn and Vanhanen's IQ and the Wealth of Nations. For a good review of Richard Lynn's more recent and comprehensive Race Differences in Intelligence, look here.
Here is another fine analysis of the concept of GDP vs. IQ--with the element of free market rules thrown in.

Of muslim nations, Malaysia has the highest average IQ, 92. Malaysia's population contains 30% ethnic Chinese. Turkey has the second highest average IQ of muslim nations at 90. All other muslim nations have average IQ's of less than 90--some of them much less.

It is possible that some individual nations are misplaced on the above table, with average IQs either a bit higher or a bit lower than stated. But it is possible to detect trends by looking at different groupings of nations and their average IQ.

Given that population average IQ needs to be at least 90 for a modern technology based nation to function, immigration policy should be oriented toward inviting high value immigrants.

Observing what happened to Zimbabwe's prosperity after Robert Mugabe drove the most prosperous (and presumably most intelligent) farmers from their land, provides a good example of what NOT to do. Idi Amin's actions in Uganda provide another example. Fidel Castro's actions in Cuba provide a third. You don't want to drive out your intelligent and resourceful groups.

Update (26Dec06): Visit this Fourmilab page for a graphic illustration of the change in average global IQ with projected population trends. Accompanying the animated graphic is a thoughtful discussion of some of the issues involved in projecting trends in global intelligence.

Thanks to an Audacious Epigone commenter.